边长为2的正方形ABCD在平面α内的射影是EFCD,如果AB与平面α的距离为2,

题型:填空题

问题:

边长为2的正方形ABCD在平面α内的射影是EFCD,如果AB与平面α的距离为
2
,则AC与平面α所成角的大小是______.
考点:空间中直线与平面的位置关系
题型:填空题

单词拼写。

根据下列句子及所给汉语注释,在横线上写出空缺处各单词的正确形式,每空只写一词。

1. He was active in politics and was strongly against ________ (奴隶制度).

2. English and ________ (美国的) spellings of some words are different.

3. His short-term ________ (记忆) was damaged in the accident.

4. The ________ (正常的) temperature for a human being, no matter in what part of the world he

    lives, is about 37℃.

5. Employers usually ________ (偏爱) candidates with some previous experience of the job.

6. We can save words by ________ (安排) the sentence like this.

7. In the US, winter wheat is ________ (收割) in the early summer.

8. I do not think there can be any doubt that she'll ________ (克服) the difficulty.

9. Neither recorders nor ________ (照相机) are allowed in the theatre.

10. He said that he hadn't been treated ________ (公平地) by the policeman.

题型:填空题

在市场经济条件下

A.政府部门直接干预企业的生产经营活动

B.企业的经济行为完全自由化

C.企业作为市场主体,拥有经营自主权

D.市场竞争无需用法律来规范

题型:填空题

零件是机器的( )。

A.制造单元

B.工作单元

C.运动单元

D.装配单元

题型:填空题

糖尿病高渗性昏迷补液中大多数用何种液体()

A.高渗盐水

B.等渗盐水

C.低渗盐水

D.等渗葡萄糖液

E.甘露醇

题型:填空题

关于物体的惯性,下列说法中正确的是()

A.运动速度大的物体不能很快停下来,是因为物体速度越大,惯性也越大

B.静止的火车启动时,速度变化慢,是因为静止时物体惯性大的缘故

C.乒乓球可以快速抽杀,是因为乒乓球惯性小的缘故

D.物体受到的外力大,则惯性小;受到的外力小,则惯性就大

更多题库