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问题 选择题

下列常见的物体通常情况下都属于绝缘体的一组是

A．汽油和盐水

B．塑料和陶瓷

C．黄铜和石墨

D．人体和大地

答案

答案：B

题目分析：A选项中，汽油是绝缘体，盐水是导体；B选项中两者都是绝缘体；C、D选项中的物体都是导体。

判断题

生产函数反映的是在既定的生产技术条件下投人和产出之间的数量关系。( )
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单项选择题

（）of the following statements is INCORRECT regarding a fire and boat drill on board your cargo vessel.

A.At least one fire and boat drill shall be held within 24 hours of leaving a port where more than 25 percent of the crew has been replaced

B.The Master is responsible in seeing that each lifeboat is lowered to the water at least once in each 6 months

C.Lifeboat equipment shall be examined at least once each month to insure that it is complete

D.An entry shall be made in the vessel's Official Logbook relative to each fire and boat drill
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