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Open the （）before starting an air compressor.

单选题
2022-02-22 23:53
A、unload valve
B、cooling water
C、oil cup
D、sum
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正确答案
A
试题解析
标签： 船舶电气与船舶安全
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保持安全值班的目的包括：（） Ⅰ、避免船舶发生碰撞事故Ⅱ、避免船舶发生火灾Ⅲ、避免船舶污染环境
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（） device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.
《船舶最低安全配员证书》编号及有效期截止日期应与船舶国籍证书编号及有效期截止日期（）。
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