在聚丙烯生产中，采用改变聚合反应器中（）的浓度来控制MFR。随着H2/C3比例增大，

用所给词的适当形式填空。

1. When is ______ (sally) birthday party?

2. December is the ______ (twelve) month of a year.

3. Mary's birthday is August _______ (eight).

4. Look at the photos of these famous _______(people).

5. There are twenty _______ (class) in our school.

下列各项会计处理方法体现谨慎性原则的是( )。

A．分期摊销大修理费用

B．应收账款计提坏账准备

C．采用工作量法计提折旧

D．存货计价采用先进先出法

在温差为1℃时单位时间内单位面积上热载体传给冷载体的热量叫（）

A、传热系数

B、比热

C、热焓

The results of the medical checkup（健康诊断） suggested that my father _____ in poor health, so the doctor suggested that he _____ smoking and take more exercise.

A．was; gave up

B．be; should give up

C．should be; gave up

D．was; give up

引起IS曲线向左方移动的原因是( )。

A．政府决定修建一条高速公路

B．政府决定降低个人所得税

C．中央银行决定降低贴现率

D．本国汇率升值