一堆煤y吨，每小时运走a吨，8小时后还剩下______吨．

读短文，选择。

Hello, Mike,

     OK, I will tell you about our school. It is not big and there are two classrooms. How many students

do we have? Only ten.  We usually go to school from Monday to Friday. We like holidays because we

don't go to school on holidays.  We usually have three classes in the morning and two classes in the

afternoon.  We usually-have reading, writing and math.  We don't have music because we don't have

music teacher in our school. Sometimes we have P. E.  class but not always:  We like P. E. class

because we can play games !                                                     

                                                                                 Yes    No

1. It's a small school.                                                    □     □

2. The school has ten teachers.                                     □     □

3. They usually have five classes every day.                  □     □

4. They have music every week.                                   □     □

5. They never have P. E. class.                                     □     □  

对“冰期”的表述中，符合文意的一项是

A．冰期的出现与消失是一个无限交替的过程

B．冰期的出现和消失与地球运行轨道有对应关系

C．冰期的出现与否与大气中的CO2没有关系

D．以上都不符合文意

刀柄的长度只要略（）孔深即可。

马克思主义最崇高的社会理想是（）

A实现 * * 主义

B实现个人的绝对自由

C消灭阶级、消灭国家

D实现 * *

两端电空制动控制器置制动位，均衡风缸减压量均会超过系统设置的190～230kPA的最大减压量，其故障原因可能是：（）

A、801至808间接点不良

B、802至808间接点不良

C、208压力开关故障或466微动开关下接点不良

D、802至806间接点不良