
【名词&注释】
叶面积(leaf area)、有利于(beneficial to)
[单选题]When placed in a magnetic field, which of the materials listed will maintain the highest permeability?( )
A. Glass
B. Bakelite
C. Soft iron
D. Aluminum
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举一反三:
[单选题]在较温暖的海水中求生者应:
A. 少穿衣服
B. 不穿衣服
C. 多穿衣服
[单选题]Which radio equipment is not necessary for the ships sailing in the sea area A2?
A. MF DSC
B. VHF radio telephone
C. VHF DSC
D. VHF EPIRB
[单选题]平衡舵有利于( )。
A. 减小舵叶面积
B. 减少舵机负荷
C. 增大转船力矩
D. 增快转舵速度
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