Therefore, the answer is: A is the condenser tube, B is the distillation flask, and C is the conical flask;

(2) According to the sequence of assembling instruments, from left to right and from bottom to top, the device is a device for distilling petroleum, so the thermometer is inserted in the distillation flask with the lower end at the branch pipe, the condenser tube in the middle and the conical bottle on the right.

So the answer is: I; h； a； k； l； b； f； g； j；

(3) Condensed water should flow in from the bottom to the top, so as to prolong the heat exchange time and make the heat more sufficient.

So the answer is: water inlet; Water outlet;

(4) The thermometer measures the temperature of steam, so the mercury ball of the thermometer should be placed at the branch nozzle of the distillation flask.

Therefore, the answer is: branch nozzle of distillation flask;

(5) In order to prevent the liquid in the flask from boiling (exploding) locally and rushing out of the flask due to uneven heating, it is necessary to add several zeolites into the flask.

Therefore, the answer is: prevent boiling;