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问题 单项选择题

汇率的管理是指通过国家外汇当局制定（）来代替自由浮动的汇率，机关、企业、团体和个人向指定银行买卖外汇时必须按照这一汇率进行折算。

A.固定汇率

B.法定汇率

C.参考汇率

D.双重汇率

答案

参考答案：B

句型转换

根据要求句型转换。

1. Before I go to school, I always make my lunch. (就画线部分提问)

                                                                                                              

2. Listen to him carefully. (改为否定句)

                                                                                                              

3. We like China very much. (就画线部分提问)

                                                                                                              

4. She does her homework every day. (改为一般疑问句) 

                                                                                                              

5. I clean my bedroom on Saturday. (用now改写句子) 

                                                                                                               
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单项选择题

在安全阀起跳的紧急停机程序中，不应进行的程序是（）。

A.切断压缩机电源

B.关闭冷水系统

C.继续运行冷却水系统

D.关闭安全阀下方的截止阀
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