在评论工作中如何做到对党负责和对人民负责的有机统一？
起吊一台重400kg的电压互感器，使用一只动滑轮，计算牵引力的大小是（）。
A. 500kg
B. 100kg
C. 200kg
D. 4000kg
Which statement is TRUE concerning radiotelephones on board towing vessels?（）
A. There cannot be a radiotelephone located anywhere except in the wheelhouse
B. The officer in charge of the wheelhouse is considered to have the radiotelephone watch
C. Only distress messages may be transmitted over channel 13
D. Only the Master of the vessel is allowed to speak over the radiotelephone
海运货物保险的被保险人在与保险公司订立保险合同时，不一定具有可保利益。
A. 正确
B. 错误
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