A steam generated by water heating and evaporation dilutes the air, which reduces the oxygen content.

B, water absorbs a lot of heat generated by combustion, so that the temperature of the ignition substance drops below the ignition point.

C, water attached to the surface of the fire, so that combustible substances do not contact with air.

37. What are the fire hazards of storage warehouses classified in the code for fire protection design of buildings? (1)

A，A，B，C，D，e。

Flammable, flame retardant and nonflammable.

C, flammable, explosive, flame retardant, incombustible four categories

38. Public gathering places must be inspected for fire prevention during business hours, at least once every few hours? (1)

First, at least once every two hours

At least once every three hours

C, at least once every four hours

39. Which of the following does not violate the fire safety regulations? (3)

A, large shopping malls stacked goods under the fire shutter.

B the fire doors leading to the closed fire stairs in the hotel are usually open.

C put the fire extinguisher in a conspicuous place, discharge it according to the regulations or put it in a place where the fire box is easy to get.

40. According to the standard of fire classification, what kind of fire does Class B fire refer to? (3)

A, metal fire

B, solid materials on fire

C liquid fire or meltable solid fire

4 1, according to the provisions of GB50 140-2005, what kind of fire does an electrically burning object belong to? (1)

Class a and e fires

Class b and c fires

C, a fire

42. In case of combustible gas fire, if the flame is extinguished, but the supply of combustible gas is not cut off, what is the danger? (1)

A, combustible gas and air mixed to form explosive mixture explosion.

Combustible gas resumes combustion.

C, flammable gas leakage pollutes the environment

43, 150 watt light bulb should be installed in what kind of lamp holder? (1)

A, porcelain lamp holder

B, bakelite lamp holder

C, waterproof lamp holder

44. How many volts of AC power should be used for portable lighting (that is, line lights) used when working in metal cans? (3)

I. 36 volts

B, 24 volts

C, 12 volt

45, household leakage circuit breaker to prevent personal electric shock should choose how much leakage current value? (1)

First, no more than 30 ma

B, no more than 50 ma

C, no more than 75 ma

46, single electric shock heartbeat and breathing have stopped using cardiopulmonary resuscitation (CPR), what should be the ratio of pressing and blowing? (2)

A. blow every 5 times 1 time.

B, blow twice every time you press 15.

C. Blow twice every time you press 10.

47. When the human body gets an electric shock, which current path is the most dangerous? (1)

A, chest to left hand

B, left foot to right foot

C. From right hand to left hand

48, which of the following measures belongs to the direct contact protection of electric shock protection measures? (3)

A, protective grounding b, leakage protection c, insulation

49. What does the clear permanent relief mark "EX" on the casing of electrical equipment mean? (2)

A, it is electrical equipment with safety certification.

B, it is explosion-proof electrical equipment.

C, it is energy-saving electrical equipment.

50, when using submersible pump, which of the following behaviors are prohibited? (1)

A, pull the cable or outlet pipe to put the water pump into the water.

B, put the pump in a strong bamboo basket, and then put it into the water.

C, first cut off the power supply and then put the water pump into the water.

5 1. What protection does the fuse have on the lighting power supply line? (3)

First, overload

B, short circuit

C, overload and short circuit

52. Grounding is the simplest way to eliminate electrostatic hazards. What static electricity is mainly used for fire fighting? (1)

First, the static electricity on the conductor

B, static electricity on insulator

C, static electricity on flammable liquid

53, single-phase two-hole socket installation wiring, phase line in which hole? (1)

A, the hole faces the right side of the socket

B, the hole faces the left side of the socket.

C, both holes will do.

54. Which of the following circuit faults will not cause fire? (3)

A, insulation damage caused by short circuit

B, poor contact

C, power failure

55. Increasing air humidity can eliminate electrostatic hazards. What is its function? (2)

A, reduce the generation of electrostatic charge

B, reduce electrostatic charge accumulation

C. neutral and static charges.

56. Using gear drive instead of belt drive can prevent electrostatic hazards. What is its function? (3)

A, reduce the accumulation of electrostatic charge

B, neutral charge and electrostatic charge

C, eliminate the source of electrostatic charge.

57, personal electric shock accident, in the rescue, what measures should be taken first? (2)

A, immediately check whether the person who gets an electric shock still has heartbeat and breathing, and if not, immediately perform cardiopulmonary resuscitation.

B, immediately disconnect the power supply, so that the electric shock is separated from the live part.

C. Call an ambulance immediately by calling 120.

58, production workshop, office, residential and other 220 volt lighting lamps and lanterns from the ground height should generally not be less than how many meters? (2)

I. 2.5 meters

B, 2 meters

c， 1.8m

59, welding machine power wiring, repair should be carried out by what person? (1)

First, an electrician with a special operation certificate

B, welder with special operation certificate

C, electrician or welder with special operation certificate

60. When welding equipment with electrical grounding protection, which of the following operations should the welder perform first? (1)

A, temporarily remove the grounding protection line of the equipment

B, increase the cross section of equipment grounding protection line

C. The equipment is repeatedly grounded.

6 1, which of the following operations of welders is illegal? (3)

A, when transferring the work place, move the welder under the condition of cutting off the power supply of the welder.

B, check the fault of the welding machine after cutting off the power supply.

C, live welding machine connector.

62. The production license system shall be implemented for special labor protection articles, and the products must be affixed with safety appraisal certificates. Which of the following protective articles does not belong to special labor protection articles? (3)

I. Safety helmet, safety belt and safety net

Anti-smashing, anti-static, conductive, acid and alkali resistant and insulating shoes

C, non-slip, heat-resistant, shockproof gloves

63. What kind of safety device does the safety valve belong to? (2)

First, interlocking

B, overrun insurance

C. monitoring and control

64. What kind of work does it take to hoist out half the objects buried in the ground by crane? (2)

I. Normal operation

B, illegal operation

C lifting safety measures for dangerous operations shall be formulated in advance.

65. How many of the following three forklift operations are illegal? (1) Lift the personnel with the bucket of forklift truck for high-altitude operation (2) Carry out maintenance under the lifted bucket (3) Shovel the materials on board directly to the dock shore (c).

One kind, one kind

two kinds

C, three kinds

66, open-air operation of gantry crane in how many levels of wind should stop operation? (2)

A, level 5 or above

B, level 6 or above

C, above level 7

67. According to the regulations of GBZ 1-2007, what is the hygienic limit of noise level in the workplace if you are exposed to noise for 4 hours every day? (2)

Answer: 85 decibels.

B, 88 decibels

C, 9 1 db

68. In hot season, workers working at high temperature should be provided with cool drinks with salt content of 0. 1%~0.2%. How high should the water temperature of the drink be? (3)

I. 25℃

b、20℃

c、 15℃

69. According to the national classification standard of physical labor intensity, which of the following grades has the lowest labor intensity? (1)

I. I-level physical labor intensity

Grade B and II physical labor intensity

Grade C and III physical labor intensity

70. How many kinds of * * * are there in the catalogue of occupational diseases published by the Ministry of Health and the Ministry of Labor and Social Security? (2)

A. Nine categories and 99 species

B, ten species 1 15 species

C, 120 Ten Species

7 1, which of the following poisons can cause aplastic anemia and leukemia? (1)

A. benzene

chlorine

Carbon and manganese

72. Which of the following dust can cause lung cancer? (2)

I. Silica dust

B, asbestos dust

C, coal dust

73. What noise reduction measures can reduce the intensity of reflected sound? (3)

First, silence

B. damping

C, sound absorption

74. What technical measures are there for dust prevention besides closed dust source and ventilation and dust removal? (1)

I. Wet operation

B, the implementation of dust responsibility system

C, regular health check for dust workers.

75. Which of the following processes produces the most harmful dust? (2)

1. When the jaw crusher breaks limestone,

When smelting copper, the molten copper evaporates into the air and then cools.

C, produced in the process of flour packaging and bagging

76. Which of the following working environments is more likely to suffer from heatstroke? (1)

First, high temperature and humidity

B, high temperature and strong thermal radiation

C, outdoor work in summer

77. When controlling dust hazards, which method should be preferred? (2)

First, ventilation and dust removal

B, sealing the dust source

C, wear a dust mask

78. When controlling noise hazards, which method should be preferred? (1)

A, reduce the noise intensity of sound source

B, weaken the noise intensity by sound propagation.

C, wear anti-noise earplugs

79. What kind of electromagnetic radiation does ultraviolet belong to? (2)

First, radio frequency radiation

B, non-ionizing radiation

C, ionizing radiation

80. Which of the following harmful gases will not combine with hemoglobin to make it lose its oxygen-carrying function, resulting in hypoxia and poisoning of human tissues? (3)

First, carbon monoxide

B. Hydrogen sulfide

C, chlorine gas

8 1, which of the following operations is more likely to suffer from electro-optic ophthalmia? (2)

I. Electroplating operation

B, manual arc welding operation

C, electrolytic aluminum smelting operation

82, a large area of skin burns, which of the following operations should not be engaged in? (3)

I. Dust operation

B, radioactive operations

C, high temperature operation

83. What is the purpose of regular health examination for workers exposed to occupational hazards? (1)

A. early detection of workers with occupational-related health damage, transfer them from their original posts and timely treatment.

B, understand the physical health of workers.

C, provide welfare benefits for workers, reflecting the concern of enterprises for employees.