【名词&注释】
使用寿命(service life)、空压机(air compressor)
[单选题]赛龙艉轴承材料的性能优于铁梨木、尼龙和层压胶木,使用寿命约为其他艉轴承材料的()倍。
A. 2
B. 4
C. 5
D. 10
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学习资料:
[单选题]主机起动用的空气瓶至少应有2个,在进行起动次数试验时,应()。
A. 开启1个空气瓶,并起动空压机补气
B. 开启2个空气瓶,并起动空压机补气
C. 开启1个空气瓶,不可补充空气
D. 开启1个空气瓶,可补充空气
[单选题]What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?()
A. 375 RPM
B. 500 RPM
C. 750 RPM
D. 1500 RPM
[单选题]Care and cleanliness are required when installing diesel fuel filters ().
A. to prevent the fuel system from becoming air-hound
B. to prevent the fuel system becoming clogged with dirty particles
C. both of the above
D. to prevent the lubricating oil from leaking out of the filter element
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