下列误差因素中属于随机误差的因素有()A、机床热变形B、工件定位误差C、夹紧误差D、

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问题:

下列误差因素中属于随机误差的因素有()

A、机床热变形

B、工件定位误差

C、夹紧误差

D、毛坯余量不均引起的误差复映

E、工作内应力误差

考点:数控车床工考试数控车床工考试题库
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下列地区属于人口稀疏地区的是:(   )

①西伯利亚 ②我国东南部沿海 ③加拿大 ④阿拉伯半岛 ⑤西欧 ⑥亚马孙平原

A.①②③④

B.②④⑤⑥

C.①③④⑥

D.③④⑤⑥

题型:多项选择题

规划具有的特征包括( )。

A.综合性

B.层次性

C.引导资源配置

D.导向性

E.协调性

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More than 20,000 drivers and front seat passengers are killed or seriously injured each year. At a speed of only 30 miles per hour it is the same as falling from a third floor window. Wearing a seat belt saves lives; it reduces your chance of death or serious injury by more than half.

Therefore drivers or front seat passengers over 14 most vehicles must wear a seat belt. If you do not, you could be fined up to $50. It will not be up to the drivers to make sure you wear your belt. But it will be the driver’s responsibility to make sure that children under 14 do not ride in the front unless they are wearing a seat belt of some kind.

However, you do not have to wear a seat belt if you are reversing(倒退) your vehicle; or you are making a local delivery or collection using a special vehicle; or if you have a valid(正当的) medical certificate(证书)which excuses you from wearing it. Make sure these cases supply to you before you decide not to wear your seat belt. Remember you may be taken to court for not doing so, and you may be fined if you cannot prove to the court you have been excused from wearing.

60. This passage is probably taken from ______.

A. medical magazine    B. a legal document

C. a textbook    D. a government information booklet

61. Wearing a seat belt in a vehicle ______.

A. reduces road accidents by more than half

B. reduces the death rate in traffic accidents

C. saves lives while driving at a speed up to 30 miles per hour  

D. saves more than 16,000 lives each year

62. It is the driver’s responsibility to ______.

A. make the front seat passenger wear a seat belt

B. make the front seat children under 14 wear a seat belt

C. stop children from riding in the front seat

D. wear a seat belt each time he drives

63. For some people, it may be better to ______.

A. pay a fine rather than wear a seat belt   

B. wear a seat belt for health reasons

C. (not to) wear seat belt for health reasons  

D. get a valid medical certificate before wearing a seat belt

题型:多项选择题

PIN码主要作用是防止SIM卡遗失而被()的现象。

题型:多项选择题

在变态反应性鼻炎中发挥主要作用的介质是()。

A.乙酰胆碱

B.IgG

C.慢反应物质

D.组胺

E.IgE

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