【名词&注释】
使用寿命(service life)、滚动轴承、工作时间(working time)
[单选题]中间轴承的布置如果数量多、间距小()。Ⅰ.则轴线变形的牵制作用增强;Ⅱ.会使轴承增加附加负荷
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ或Ⅱ
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学习资料:
[单选题]滚动轴承累积工作时间达到其额定使用寿命时即应换新轴承。一般累积工作时间约为()h。
A. 5000
B. 8000
C. 10000
D. 12000
[单选题]() is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
A. An air receiver
B. An operating valve
C. An automatic valve
D. An air distributor
[单选题]Dirty oil must be () before being used again.
A. mixed with clean oil
B. purified
C. heated
D. strained
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