禁止地面向起重机上或从起重机上向地面抛物品,如必须递送物件时,应用()、()递送。
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目前UN业务的折标系数正确的为()
A. 0层按照100%
B. 一层按照50%
C. 二层按照30%
D. 三层按照30%
The pivot pin at the base of a sheath-screw boom davit must be().
A. inserted each time before the booms are cranked out
B. periodically removed for inspection and lubricated
C. replaced at each inspection for certification
D. in the locked position after the boat is cradled and griped dow
细菌的化学组成包括蛋白质、无机盐、糖类、脂肪和水等。
A. 正确
B. 错误