离心式压缩机调速机构不灵活的处理方法是（）
A.更换合格润滑油
B.更换压力表
C.调节油冷器冷却水流量
D.做好蒸汽的脱水工作
参考答案：A
脊麻病人注入局麻药7分钟后，脉搏由85次/分降至45次/分，原因是（）
A.反射性迷走神经兴奋
B.心交感神经受抑制
C.用药量过大
D.双下肢肌肉瘫痪
E.副交感神经受到抑制
句型转换。
1. What other things did you do on your day off? (变为同义句)
_____ _____ did you do on your day off?
2. Our class had a great time on the school trip. (变为同义句)
Our class _____ _____ on the school trip.
3. Our school trip was very interesting. (对画线部分提问)
_____ _____ your school trip?
4. There was only one sandwich. (对画线部分提问)
_____ _____ _____ _____ there?
5. He met Tina on his way home. (变为否定句)
He _____ _____ Tina on his way home.
