位错是一种()。A.线缺陷 B.点缺陷 C.面缺陷 D.不确定

题型:单项选择题

问题:

位错是一种()。

A.线缺陷

B.点缺陷

C.面缺陷

D.不确定

考点:机械工程金属材料与热处理金属材料与热处理题库
题型:单项选择题

关于中成药中含有化学药成分

抗感灵片含

A.对乙酰氨基酚、氯苯那敏、维生素C
B.对乙酰氨基酚、氯苯那敏、咖啡因
C.阿司匹林、氯苯那敏
D.对乙酰氨基酚
E.麻黄碱、碳酸钙

题型:单项选择题

鉴别肾性高血压和原发性高血压的要点是______

A.血压高低

B.有无血尿

C.有无肾损害

D.有无左心室增大

E.尿改变和高血压发病的先后

题型:单项选择题

单词拼写。

1. This is my ________ (八) birthday.

2. Thomas Edison was a great American ________ (发明).

3. We can get a lot of ________ (信息) from the Internet.

4. It is said that the population may be seven ________ (十亿) by the year 2010.

5. Everyone went to the cinema ________ (除……之外) Li Ming.

6. Mike enjoyed ________ (he) very much at the party.

7. We'll have a ________ (discuss) at two this afternoon.

8. The boy was ________ (excite) about playing football.

9. My mother always keeps me ________ (practise) spoken English in the morning.

10. The population in China is ________ (large) than that in India.

题型:单项选择题

以下不能正确计算代数式

sin2(

)值的C语言表达式是______。

A.1/3*sin(1/2)*sin(1/2)

B.sin(0.5)*sin(0.5)/3

C.pow(sin(0.5), 2)/3

D.1/3.0*pow(sin(1.0/2), 2)

题型:单项选择题

分析测定中的偶然误差,就统计规律来讲,其()。

A.数值固定不变

B.有重复性

C.大误差出现的几率小,小误差出现的几率大

D.正误差出现的几率大于负误差

E.具有单向性

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