汽车专业英语答案2023

第四章测试

1.An average air/fuel ratio for good combustion is about ( ) by weight.
A:18:1
B:20:1
C:13:1
D:15:1

答案:D
2.A valve consists of a( )and ( )stem. （ ）
A:rocker
B:stem
C:head
D:tappet
3.The ( )provides the force necessary to close the valve and hold it tightly against its seat.
A:valve spring
B:valve
C:rod
D:tappet
4.The inlet valve is opened before TDC and closed after BDC.（ ）
A:对 B:错 5.Camshaft's function is to deliver spark positively and timely in a definite sequence. （ ）
A:对 B:错