答案查看网,轻松搜题/搜资源
登录
×
登录账号
记住密码
立即注册
忘记密码
×
注册
使用微信扫描二维码,获取账号密码后免费查看答案
前往登录
忘记密码
×
忘记密码
使用微信扫描下方二维码,即可找回您的账号密码
前往登录
立即注册
搜题/搜资源
【单选题】【消耗次数:1】
排气门开闭的四个时期中,()的改变对充气效率影响最大。
①
排气提前角
②
排气迟闭角
③
进气提前角
④
进气迟闭角
参考答案:
复制
纠错
相关题目
【单选题】
某发动机的进气提前角为α,进气迟关角为β,排气提前角为γ,排气迟关角为δ,则该发动机的进、排气门重叠角为( )。
①
α+δ
②
β+γ
③
α+γ
④
β+δ
查看完整题目与答案
【判断题】
进气门头部直径通常要比排气门的头部大,而气门锥角有时比排气门的小
①
正确
②
错误
查看完整题目与答案
【简答题】
初始点火提前角又称[填空]点火提前角。
查看完整题目与答案
【单选题】
开关信号等)适当增大或者减小点火提前角,此时,引入的点火提前角称作()。
①
修正点火提前角
②
基本点火提前角
③
初始点火提前角
④
都不是
查看完整题目与答案
【判断题】
由于气门的早开晚关, 使进排气门在排气行程上止点均打开
①
正确
②
错误
查看完整题目与答案
【单选题】
汽油发动机发出最大功率和最小油耗的点火提前角为最佳点火提前角,该点发生在以下()冲程。
①
进气
②
压缩
③
做功
④
排气
查看完整题目与答案
【多选题】
气门重叠角等于下列哪些角度之和?()
①
进气提前角
②
进气迟后角
③
排气提前角
④
排气迟后角
查看完整题目与答案
【判断题】
初始点火提前角我们称之为固定点火提前角
①
正确
②
错误
查看完整题目与答案
【判断题】
发动机点火提前角由基本点火提起前角和修正点火提前角组成。()
①
正确
②
错误
查看完整题目与答案
【判断题】
基本点火提前角是发动机最主要的点火提前角
①
正确
②
错误
查看完整题目与答案
随机题目
【单选题】
Good morning, Dr Johnson’s office. Can I help you?
①
Speaking, please
②
I’d like to make an appointment, please
③
Yes, go on
④
No, you can’t
查看完整题目与答案
【单选题】
The population of many Alaskan cities has __________ doubled in the past three years.
①
larger than
②
as great as
③
more than
④
as many as
查看完整题目与答案
【单选题】
The match was cancelled because most of the members __________ a match without a standard court.
①
objected to having
②
objected to have
③
were objected to have
④
were objected to having
查看完整题目与答案
【单选题】
- Shall we sit up here on the grass or down there near the water?
①
I’d rather stay here if you don’t mind
②
Sorry, I don’t like neither
③
Certainly, why not?
④
Yes, we like these two places
查看完整题目与答案
【单选题】
He said he would continue a support us _____ we didn’t break the rules.
①
as well as
②
as soon as
③
as far as
④
as long as
查看完整题目与答案
【单选题】
Can I have a look at your passport?
①
It is here
②
Here is it
③
Here you are
④
No, you can’t
查看完整题目与答案
【单选题】
Her sun – tanned face suggested that she __________ in excellent health.
①
be
②
is
③
was
④
were
查看完整题目与答案
【单选题】
Yesterday was my birthday. My mother .
①
made a cake to me
②
made a cake me
③
made for me a cake
④
made me a cake
查看完整题目与答案
【单选题】
That probably explains why public opinion is broadly __________ euthanasia (安乐死), or at least certain forms of it.
①
in relation to
②
in contrast to
③
in excess of
④
in favor of
查看完整题目与答案
【单选题】
Young children often can’t __________ between TV programs and commercials.
①
separate
②
distinguish
③
compare
④
contrast
查看完整题目与答案