通常，当气缸套磨损量超过（）时，燃烧室就会失去密封性（D为缸

【名词&注释】

耐磨性(wear resistance)、绝缘性(insulating)、密封性(sealing)、燃烧室(combustion chamber)、缸套磨损量(the wear of cylinder)、气缸套磨损

[单选题]通常，当气缸套磨损量^{(the wear of cylinder)}超过（）时，燃烧室就会失去密封性（D为缸径）。

A. A．0.1%～0.2%
B. B．0.2%～0.4%
C. C．0.3%～0.6%
D. D．0.4%～0.8%

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学习资料：

[单选题]串联连接系统的可靠度（）组成该系统各部件的可靠度。

A. 等于
B. 大于
C. 小于
D. 大于、等于

[单选题]桦木层压胶木是铁梨木的代用材料，具有材质致密、坚硬、耐热、绝缘性好、成材率高，缺点是（）。Ⅰ.耐磨性差；Ⅱ.耐蚀性差；Ⅲ.耐水浸性差；Ⅳ.刚性差；Ⅴ.脆性大。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅴ
C. Ⅱ＋Ⅴ
D. Ⅱ＋Ⅳ

[单选题]If （） are taken at regular intervals, any unequal distribution of load will be easily found out.

A. differential of crank-webs
B. indicator diagrams
C. lube oil reading out
D. misalignment of crank-throw

[单选题]The crankcase can not be opened （）the parts have been cooled down.

A. if
B. as
C. unless
D. whe

[单选题]The lower end of each piston rod is reduced in diameter to fit a bore in （）, this being secured to the piston rod by a nut.

A. the crank-web
B. the connecting rod
C. the main bearing
D. the cross-head

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