在汽车的8管硅整流发电机内,其三相绕组的中性点上接有两个二极管,通过中性点()原理可

题型:单项选择题

问题:

在汽车的8管硅整流发电机内,其三相绕组的中性点上接有两个二极管,通过中性点()原理可增大输出电流。

A、利用基次谐波

B、利用偶次谐波

C、利用三次谐波

D、利用共振

考点:汽车修理工考试汽车修理工(中级)汽车修理工(中级)题库
题型:单项选择题

Look _________ the pictures and listen _________ me. [ ]

A. to, at         

B. at, to        

C. at, at         

D. to, to 

题型:单项选择题

体外受精-胚泡移植适用于()

A.免疫性不孕

B.输卵管性不孕

C.幼稚子宫

D.卵巢功能不全引起不孕

E.颈管粘连闭塞

题型:单项选择题

在探究电路连接的实验中,小明同学用电压表测出两电灯两端的电压均相等,因此他得出结论是:这两只灯泡是并联的.小明的推理正确吗?为了进一步弄清两灯泡的连接情况,请你帮助小明想想办法.

题型:单项选择题

第二节:读写任务(满分25分)

阅读下短文,然后按照要求,写一篇150词左右的英语短文。

The motor vehicle has killed and disabled more people in its brief history than any bomb or weapon ever invented. Much of the blood on the street flows essentially from uncivil behavior of drivers who refuse to respect the legal and moral rights of others. So the killing on the road may be regarded as a social problem.

In fact, the enemies of society on wheels are rather harmless people, just ordinary people acting carelessly, you might say. But carelessness is no excuse when one’s actions could bring death or damage to others. A minority of the killers go even beyond carelessness to total negligence(疏忽).

Researchers have estimated that as many as 80 per cent of all automobile accidents are caused due to the psychological(心理的) condition of the driver. Emotional upsets can slow drivers’ judgment and reactions, and blind them to dangers that might otherwise be evident. The experts warn that it is important for every driver to make an effort to keep one’s emotions under control.

Yet drivers are not the only people to blame for road accidents. Street walkers regularly break traffic regulations, they are at fault in most vehicle walker accidents; and many cyclists even believe that they need not follow the basic rules of the road.

[写作内容]

概括短文的内容要点,该部分约30词;

就“如何减少交通事故”这个主题发表你的看法,至少包含以下的内容

要点,该部分约120词;

交通事故造成的生命财产的损失;

人们应做出什么努力来减少交通事故的发生;

政府应采取什么措施来减少交通事故的发生。

[写作要求]

1.题目自定

2.你可以使用实例或其它论述方法支持你的论点,也可以参照阅读材料的

内容,但不要抄袭阅读材料中的句子。

[评分标准] 概括的准确性、语言的规范性、内容的合适性以及篇章的连贯性。

题型:单项选择题

数据库管理系统中,为了保证事务的正确执行,维护数据库的完整性,要求数据库系统维护以下事务特性:原子性、______、隔离性和持久性。

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