DDZ－Ⅲ型仪表的电源为24VDC，标准输出信号为4～20mADC。（）
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Which of the following precautions should always be carried out in dry dock?（）
A. Liquids should never be transferred between tanks without consulting the dock master
B. If sea valves have been disassembled, all bonnets must be checked for leakage when the ship is re-floated
C. Before re-floating, all sea chest strainers should be verified as having been replaced
D. All of the above
倾斜井巷运输时，矿车之间的连接、矿车与钢丝绳之间的连接，（）使用不能自行脱落的连接装置，并加装保险绳。
A. 严禁
B. 必须
C. 不得
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