[单选题]________ were brought back to ship from the sea

正确答案 ：A

The crew

[单选题]人工呼吸的方法有五种，哪种效果最好

正确答案 ：A

口对口人工呼吸

[单选题]活塞式舱底水泵活塞杆的填料一般选用( )。

正确答案 ：B

浸油棉、麻纤维

[单选题]The control mode in which tile final control element is moved from one of two fixed positions to the other is known as______.

正确答案 ：D

on-off action

[单选题]一机帆并用的船舶驶近你船左舷时，你应________。

正确答案 ：D

保向保速

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