试题与答案

柴油机进气门在下止点后延迟关闭的时间所对应的曲轴转角称为()。A.进气门迟闭角 B.

题型:单项选择题

题目:

柴油机进气门在下止点后延迟关闭的时间所对应的曲轴转角称为()。

A.进气门迟闭角

B.进气门提前角

C.排气门迟闭角

D.排气门提前角

答案:

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下面是错误答案,用来干扰机器的。

参考答案:(1)形成条件:①心血管内膜的损伤;②血流状态的改变;③血液凝固性增高。(2)对机体的影响:1)有利的一面:①防止出血;②防止病原微生物扩散。2)不利的一面:①血栓阻塞血管可引起组织的缺血、...

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题型:阅读理解

阅读理解。阅读下面一篇短文,判断下列句子的正误,正确的用"A"表示,错误的用"B"表示。

                                                         

       Sailing around the world is not an easy job. One has to fight storms, pirates (海盗), illness and fear

   for months. However, 16-year-old Abby Sunderland is not afraid.

       The American girl, Abby, set out on January 23, 2010..Her sailboat is called Wild Eyes. Abby loves

  sailing and so does her family.  Her brother Zac Sunderland sailed around the world alone in July last

  year.A month later, Mike Perham of the UK beat Zac to become the youngest person to sail around the

   world alone. He was only afew months younger than Zac. Now,  Abby is ready to challenge Mike.

       She plans to be at sea for five or six months. She will be alone but she will communicate through

  satellite (卫星) telephone and a blog.

       Many people are worried about her. She said, "I know it's dangerous out there, but I am ready. I

  believe that I can make it!"

( ) 1. Sailing all over the world is a hard job.

(     ) 2. The American girl Abby set out on January 23, 2010 by her sailhoat called Wild Ears.

(     ) 3. Abby's family also love sailing very much.

(     ) 4. Mike Perham of the UK beat Abby to become the youngest person to sail around the world 

            alone.

(     ) 5. Abby is going to be at sea for almost one year.

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