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钢按（）分为沸腾钢、镇静钢和半镇静钢。

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液压支架不挤不咬架间间隙应不大于（）毫米。

A. 400
B. 200
C. 500

Basic emergency care for third degree electrical burn is to（）.

A. flood the burned area with warm water for two minutes
B. brush away the charred skin and wrap the burned area
C. cover the burned area with a clean cloth and transport the patient to a medical facility
D. apply ointment or spray to the burned area and wrap with a clean cloth

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矿井必须建立测风制度，每15天进行一次全面测风。

A. 正确
B. 错误

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建立最低生活保障制度要遵循（）原则、普遍性原则、法制化原则和（）原则。

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