In heavy seas you decide to heave to. The lifeboat should be().
A. brought to a position with the stern into the seas
B. allowed to take its own head
C. brought to lay in the trough
D. brought bow into the sea
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根据《长途光缆波分复用(WDM)传输系统设计规范》,WDM传输系统工程设计时,公务联络系统,应具备选址呼叫方式和群址呼叫方式。
A. 正确
B. 错误
成交时一瞬间的事情,事先没有任何征兆。
A. 正确
B. 错误