汽车专业英语_智慧树知到答案2021年

第四章 配气机构：本章介绍发动的另一重要机构—配气机构，重点讲解了配气机构的组成及配气定时。4.1配气机构概述:本小节讲述了配气机构的主要作用、基本构成及其特点。
4.2气门传动组:本小节主要介绍气门传动机构的各零部件结构及其特点。
4.3气门及配气定时:本小节主要介绍气门机构，并从进气配气定时、排气配气定时、气门重叠来讲解配气相位。

[单选题]An average air/fuel ratio for good combustion is about ( ) by weight.

选项:[13:1
, 20:1
, 15:1
, 18:1
]
[多选题]A valve consists of a( )and ( )stem. （ ）

选项:[rocker
, tappet
, head
, stem
]
[单选题]The ( )provides the force necessary to close the valve and hold it tightly against its seat.

选项:[tappet
, valve spring
, valve
, rod
]
[单选题]The inlet valve is opened before TDC and closed after BDC.（ ）

选项:[对, 错]
[单选题]Camshaft's function is to deliver spark positively and timely in a definite sequence. （ ）

选项:[对, 错]