四冲程汽油机在进气行程活塞到达下止点时,曲轴转过半周,进气门(),进气行程结束。

题型:填空题

问题:

四冲程汽油机在进气行程活塞到达下止点时,曲轴转过半周,进气门(),进气行程结束。

考点:场(厂)内专用机动车辆作业场(厂)内专用机动车辆作业题库
题型:填空题
在比例尺是
1
2000
的地图上,量得一条路长7.5厘米,这条路的实际长度是______米.如果改用1:3000的比例尺,这条路在图上应画______厘米.
题型:填空题

补全对话。

A.See you later.

B.What does he look like?

C.My parents are both from Paris.

D.What does he do?

E.Do you have any brothers or sister?

F.My parents are both fifty years old.

G.Do you have a big family?

John: Hi, Mike. Where is your family from?

Mike: Well. 1._____How about you? Where's your family from?

John: My parents are from Australia, but I was born in Toronto.

Mike: Really? 2._____

John: Yes. There are six people in my family. I have a brother and two sister in high school. 3._____Mike: Yes. I only have a brother. He has two kids.

John: Oh. 4._____

Mike: He is a nusician.

John: Cool! Oh, I have to go! I will have a class in five minutes.

Mike: OK, John. 5._____

John: See you.

1. _____ 2. _____ 3. _____ 4. _____ 5. _____

题型:填空题

要改变养路机械液压传动系统中的活塞运动速度不能只改变进入油缸内油液的流量。

题型:填空题

科学家研制出一种清洁的超级跑车,它的动力来源是氢气,它排出的唯一废物是什么?()

A.一氧化碳

B.二氧化碳

C.氧气

D.水蒸气

题型:填空题

在公有继承的情况下,基类的成员在派生类中的访问权限为()。

A.公有

B.私有

C.保持不变

D.受保护

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