柴油机气门在完全()状态下,气门杆端面与摇臂端面间的间隙称为气门间隙。
A.关闭
B.开启
C.排气门开启
D.进气门开启
参考答案:A
______clearly in class, Mr. Smith raised his top voice to ask his students to stop chatting.
A.Found not heard
B.Found not hearing
C.Finding not heard
D.Finding not hearing
某煤样的分析基水份为10%、灰份为8%、挥分份为27%,该煤样的固定碳含量为()。
A、90%
B、82%
C、63%
D、59%