单选题
发布日期:2021-03-22
Have your crew check them annually
They do not need any maintenance
Have them sent ashore to an approved maintenance facility annually
Have them serviced by the shipyard annually
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衡量数字传输系统传输效率指标的单位应当是()。
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妊娠期母体血容量达到高峰时间为()
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