Beforebeingusedthefuelservicetankshouldbedrainedof().
A. sodasolution
B. mechanicalimpurities
C. ballast
D. waterandresiduals
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Beforereplacingapistonyoushouldcheckthatallringsare().
A. free
B. fastened
C. broken
D. stuck
Beforereplacingapistonyoushouldchecktheringstoseethatallclearancesandgapsare()thepermissibletolerances.
A. above
B. at
C. over
D. within
汽油发动机燃烧过程分为诱导期、()和补燃期。
A. 着火落后期
B. 明显燃烧期
C. 速燃期
D. 缓燃期
CO2全淹没灭火系统的设计浓度,应根据被保护对象灭火浓度取值,应不小于灭火浓度的()倍。
A. 1.2
B. 1.4
C. 1.7
D. 2.0