sin40°sin80°-sin50°sin10°=______.

题型:填空题

问题:

sin40°sin80°-sin50°sin10°=______.

考点:三角函数的诱导公式两角和与差的三角函数及三角恒等变换
题型:填空题

单词拼写。

根据句意和汉语及首字母提示,补全下列各句。

1.The word "honesty" is an____(抽象)noun.

2. Which do you like better, his painting or____(雕 塑)?

3. There are many art___(画廊)in New York.

4. An a____ country is always ready to start a war.

5. His a____ is to be a successful writer.

6. You'll soon be c___ that she is right, though you think not now.

7.The prisoners a___ to escape, but failed.

8. The keys are in the p___ of the boss.

9. I'm afraid I've never been much of a____(学者).

10. The book is t___ of its kind.

11. We've already bought the house but we don't take ___of it until May.

12. In the picture the tree is the s____ of life, while the snake stands for evil.

13. I____(试图)to speak but was told to be quiet.

14. The rain was heavy; c___, the road was flooded.

15. You look r____(可笑的)in those tight jeans.

题型:填空题

比2.5大而比2.9小的数只有3个.______.

题型:填空题

对于某反应x+3y=2E+2F在甲、乙、丙、丁四种不同条件下。分别测得反应速率为甲:0.3 mol/(L·min) ;乙:1.2mol/(L·min);丙:0.8mol/(L·min);丁:0.9mol/(L·min),则反应最快的是[ ]

A.甲

B.乙

C.丙

D.丁

题型:填空题

计算机系统的性能指标主要包括( )。

A.字长

B.主频

C.内存容量

D.运算速度

题型:填空题

在线性结构中,队列的操作顺序是先进先出,而栈的操作顺序是______ 。

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