About 1 and 15 minutes, the specific time is related to the size and firepower of the crab. Usually steam on high fire for about 5 minutes, and then continue to steam on low fire for a while. The exact time depends on the size of the crab. Keep steaming for about 3 pairs of crabs 10 minute, 3-4 pairs of crabs 12 minute, and more than 4 pairs of crabs 15 minute. Usually, for every weight gain 1, the steaming time will increase by about 2 minutes.

2. Crab belongs to Lepidoptera and is a crustacean. Their bodies are protected by hard shells, and they breathe through their gills. Taxonomically, it is the same kind of animal as shrimp, lobster and hermit crab. Most kinds of crabs live in the ocean or offshore areas, and some live in fresh water or land. Common crabs are Portunus trituberculatus, Portunus trituberculatus, Eriocheir sinensis and Eriocheir sinensis (Eriocheir sinensis, Eriocheir sinensis and Eriocheir sinensis).