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根据保险利益原则，财产保险在保险事故发生时，人身保险在保险合同成立时，被保险人或投保人对保险标的必须具有保险利益。()

A. 正确
B. 错误

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真空断路器的优点是：外形尺寸小；重量（）；（）磨损小；不需检修，开断性能好，可在两个周期内开断；无火灾危险，操作噪声小等。

高压断路器能根据需要，将电路设备或线路投入（或退出）运行，能在某些电气设备或线路发生故障时，将（）从电网中快速切除，保证电网无（）正常运行。

Most troubles likely to occur with marine diesel engine can, if located in time, be remedied with no difficulty and many can be （）if the engine is maintained with a high sense of responsibility to the people on the part of the motormen and engineers.

A. found out
B. eliminated
C. avoided
D. lowered

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