机电式程序控制器是由()组成。 A.小型同步电机、凸轮触点组 B.齿轮减速机构、凸轮

题型:单项选择题

问题:

机电式程序控制器是由()组成。

A.小型同步电机、凸轮触点组

B.齿轮减速机构、凸轮触点组

C.小型异步电机、凸轮触点组

D.小型同步电机、齿轮减速机构、凸轮触点组

考点:家电维修工试题家电维修工试题题库
题型:单项选择题

1922年孙中山说:“中华民国就像我的孩子,他现在有淹死的危险。……我向英国和美国求救,他们站在岸上嘲笑我。”为改变这种现状,他此后的努力有

①同意国共合作 ②领导护国运动 ③提出“新三民主义”④领导北伐战争 [ ]

A.①③

B.②③

C.②④

D.①④

题型:单项选择题

纠错编码中加的监督码越多()。

A、纠检错能力越强,编码效率越低;

B、纠检错能力越差,编码效率越低;

C、纠检错能力越强,编码效率越高;

D、纠检错能力越差,编码效率越高。

题型:单项选择题

若有以下定义: inta[]={1,2,3,4,5,6,7}; char cl=’b’,c2=‘2’; 则数值不为2的表达式是( )。

A.a[1]

B.’d’-c1

C.a[‘3’-c2]

D.c2-0

题型:单项选择题

杠杆卡规是利用()放大原理制成的器具

题型:单项选择题

阅读理解。

     American this year will swallow 15,000 tons of aspirin, one of the safest and most effective drugs

invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad

effects are relatively mild and it is cheap.

     For millions of people suffering from arthritis (关节炎). It is the only thing that works. Aspirin, in

short, is truly the 20th-century wonder drug. It is also the second largest suicide drug and is the leading

cause of poisoning among children. It has side effects that, although relatively mild, are largely unrecognized

among users.

     Although aspirin was at first sold by a German company in1899, it has been around much longer than

that. Hippocrates, in ancient Greek, understood the medical value of the leaves and tree bark which today

are known to contain salicylates (水杨酸碱), the chemical in aspirin. During the 19th century, there was

a great deal of experimentation in Europe with this chemical, and it led to the introduction of aspirin. By 1915,

aspirin tablets were available in the United States.

     A small quantity of aspirin (two-grain tablets) relieves pain and inflammation. It also reduces fever by

interfering with (干预) some of the body's reactions.

1. The passage is written to ______.

A. suggests us using more aspirin

B. reminds us of the side effects of aspirin

C. gives us a whole view of aspirin

D. discusses the good effects of aspirin

2. According to the author, aspirin ______.

A. is very safe

B. first appeared in 1899

C. can be harmful to children

D. can hardly be dangerous

3. Generally speaking, the author seems to be ______.

A. in favour of aspirin

B. against the use of aspirin

C. not interested in aspirin

D. careful in using aspirin

4. What is the best title for this passage?

A. How to Use Aspirin

B. Why I Take Aspirin

C. The Most Popular Medicine

D. The Side Effects of Aspirin

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