【名词&注释】
工作能力(work ability)、流线型(streamline)、不低于(no less than)
[单选题]字头销外圆表面的过度磨损常采用()工艺修复。
A. 镀镍
B. 镀铁
C. 镀铬
D. 镀锌
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[单选题]由n个独立部件组成一个并联连接系统,其中一个部件正常工作,系统就正常工作,则该系统为()。
A. 冗余系统
B. 表决系统
C. 混合系统
D. 储各系统
[单选题]某产品在1万h内工作的可靠度R(t)=0.95,说明该产品()。Ⅰ.5%的产品可保持不低于1万h的工作能力;Ⅱ.95%的产品可保持不低于1万h的工作能力
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ或Ⅱ对
D. Ⅰ,Ⅱ都不对
[单选题]当曲柄的Δ=(+)值时,该曲柄的两个主轴承位置较(),曲轴轴线呈()状态。
A. 低/“∪”
B. 高/“∪”
C. 低/“∩”
D. 高/“∩”
[单选题]流线型舵的缺点是()。Ⅰ.结构复杂;Ⅱ.舵效低;Ⅲ.造价高;Ⅳ.阻力大;Ⅴ.产生的水动力小。
A. Ⅰ+Ⅲ
B. Ⅰ+Ⅳ+Ⅴ
C. Ⅲ+Ⅳ+Ⅴ
D. Ⅰ+Ⅲ+Ⅳ
[单选题]High-speed rotating in a centrifugal purifier can produce a force () larger than the force of gravity.
A. many thousand times
B. between times
C. one time
D. at time
[单选题]In a four-stroke engines the camshaft rotates at ().
A. half the engine rotational speed
B. twice the engine rotational speed
C. the engine rotational speed
D. four times the engine rotational speed
[单选题]The energy for pushing this piston up can be supplied from (), so that the piston can keep moving up and down.
A. the same piston
B. the piston nearby
C. the other pistons
D. the generators on board
[单选题]Vessels required to be equipped with an approved backfire flame arrester are().
A. those with diesel engines
B. all those with gasoline engines
C. those with large engines only
D. None of the above
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