A hygroscopic cargo is define as a cargo（）.
A. capable of absorbing moisture in the form of a gas
B. capable of giving off moisture in the form of a liquid
C. that is shipped in a liquid stste
D. that will ignite in contact with water
停电线路的验电应逐相进行。联络用的开关或刀闸检修时，应在（）
A. 受电侧验电
B. 送电侧验电
C. 两侧验电
D. 开关或刀闸本体上验电
挖掘机施工过程，对于上方不同电压的电线，应保持的安全距离分别是多少？
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