知到答案汽车专业英语智慧树答案_2022年

第四章

An average air/fuel ratio for good combustion is about ( ) by weight.
答案:15:1
A valve consists of a( )and ( )stem. （ ）
答案:head;stem
The ( )provides the force necessary to close the valve and hold it tightly against its seat.
答案:valve spring
The inlet valve is opened before TDC and closed after BDC.（ ）
答案:对
Camshaft's function is to deliver spark positively and timely in a definite sequence. （ ）
答案:错