正确答案: C
镀铬
题目:字头销外圆表面的过度磨损常采用()工艺修复。
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学习资料的答案和解析:
[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()。
冗余系统
[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
仅Ⅱ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。
低/“∪”
[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。
Ⅰ+Ⅲ
[单选题]High-speed rotating in a centrifugal purifier can produce a force () larger than the force of gravity.
many thousand times
[单选题]In a four-stroke engines the camshaft rotates at ().
half 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.
the other pistons
[单选题]Vessels required to be equipped with an approved backfire flame arrester are().
all those with gasoline engines