正确答案: D

D．0.4%～0.8%

题目：通常，当气缸套磨损量超过（）时，燃烧室就会失去密封性（D为缸径）。

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学习资料的答案和解析：

[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。

小于

[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。

Ⅰ＋Ⅴ

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

differential of crank-webs

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

unless

[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.

the cross-head