若已知角α的终边上有一点P(3a,4a),其中a≠0,则sinα=( ) A.±4

题型:选择题

问题:

若已知角α的终边上有一点P(3a,4a),其中a≠0,则sinα=(  )
A.±
4
5
B.
4
5
C.±
3
5
D.
3
5
考点:任意角的三角函数
题型:选择题

据下列句子及所给汉语注释,在答题卡的横线上,写出空缺处各单词的正确形式。(每空只写一词)

1. He have mended the woodwork and ______(油漆) the walls.

2. Can you i_____ what it would be like to live without electricity?

3. The rain was b______ against the windows.

4. His _______(秘书) says he's still out at lunch.

5. He's often here, but ______(奇怪) enough, I've never met him.

6. This is one of Bach's later ______ (作品).

7. The daughter of my sister is my n______.

8. My nose is ______(堵塞) because of a heavy cold.

9. They crossed the English Channel in a hot-air ______(气球).

10. I would like a room with a ______(双人的) bed.

题型:选择题

沉淀设备中,悬浮物的去除率是衡量沉淀效果的重要指标。

题型:选择题

“以德强国”体现了:()

A.道德可以代替法律

B.道德和法律相对立

C.道德和法律可以并存

D.道德和法律相辅相承,互相促进

题型:选择题

对该患者下述检查最有意义的是

A.Coombs试验

B.酸溶血试验

C.冷热溶血试验

D.高铁血红蛋白还原试验

E.异丙醇试验

题型:选择题

复方新诺明的组成成分是( )。

A.SML

B.SMZ

C.SD

D.SA

E.TMP

更多题库