根据企业国有产权转让的有关规定，在产权交易过程中，当交易价格低于评估结果的( )时

句型转换。

1. He ought to help his friend work out the problem. (改为否定句)

_______________________________________________________

2. Tom ought to go to join the party. (改为一般疑问句)

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3. Must we stay at home?  (作否定回答)

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4. Our computer needs reparing. (改为同义句)

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His father is a _____, he _____ well.[ ]

A. cooker; cooks                      

B. cook; cooking   

C. cook; cooks                        

D. cook; is cooking

牵引电动机的工作条件非常恶劣，关于牵引电动机的工作环境说法错误的是（）。

A、负载变化较大

B、承受来自轮轨的冲击力

C、使用环境恶劣

D、三相整流器供电，电流是脉动的

桂枝茯苓丸的服用方法是( )

A．饭前

B．饭后

C．晨起

D．睡前

* * 衙门