In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the()
A. exhaust manifold
B. valve bridge
C. pressure of the fresh air charge
D. valve adjusting gear
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继父或继母和未受其抚养教育的继子女间的关系,在亲属分类上属于()。
A. 姻亲
B. 血亲
C. 拟制血亲
在倾角超过25°的巷道中装车时,煤矸不得超过车上沿。
A. 正确
B. 错误