五边仪表飞行需要注意情况（）？A、无线电高度和气压高度 B、空速 C、下滑道偏离

阅读短文，选择正确答案。

      Hello, I'm Amy. I'm twelve years old. I go to school from Monday to Friday. We have four classes in the

morning and two in the afternoon. On Mondays we have math, Chinese and music. On Tuesdays we have

English and science. I like Wednesdays and Fridays, because we have computer classes. I like computer class.

I like my computer teacher. He is tall and cool. He's very smart.

1. How many classes does Amy have in the morning?

A. Two.

B. Four.

C. Six.

2. What do we have on Mondays?

A. Math, Chinese and music.

B. Computer class.

C. English and math.

3. I like ____________.

A. Mondays and Tuesdays

B. Wednesdays and Fridays

C. Tuesdays and Wednesdays

4. What's my computer teacher like?

A. He's tall and cool.

B. I like computer class.

C. Yes, he is.

5. How old is Amy?

A. 13.

B. 12.

C. 14.

小明家买了一袋大米，第一周吃去9千克，第二周吃去6千克，还剩下40%．这袋大米共多少千克？

如图所示，斜面倾角为θ，高为h．质量为m的小物块从斜面的顶点由静止开始加速滑下，已知物块与斜面间的动摩擦因数为μ．

求（1）物块下滑过程中加速度的大小；

（2）到达斜面底端时速度的大小；

（3）由顶点下滑到底端的过程中，所用的时间．

解不等式组

并写出不等式组的正整数解．

仪表显示当前发动机转速是6000转/分钟。