【名词&注释】
气胀式救生筏、在海上
[单选题]船舶在海上航行遇到风浪之后产生谐摇，为减轻横摇可采取的措施包括( )。Ⅰ.调整船的横摇周期;
A. Ⅱ.调整吃水差;
B. Ⅲ，调整航速;
C. Ⅳ.调整航向。
D. Ⅰ～Ⅲ
E. Ⅰ、Ⅱ、Ⅳ
F. Ⅱ～Ⅳ
G. Ⅰ、Ⅲ、Ⅳ
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举一反三：
[单选题]气胀式救生筏的降落装置可分为（）。①抛投式②机械吊放式③自由滑落式
A. ①②
B. ②③
C. ③
[单选题]Which statement is NOT true?
A. While displacement pump works, volume of the working chamber will increase and decrease alternately
B. A gear pump always has two gears
C. Any vane pump will have a rotor within a ring
D. A balanced vane pump has two outlet ports and they are positioned symmetrically
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