当进行胸外按压时，按压位置是A．胸骨上半部分 B．胸骨正中线左侧的心前驱 C．胸骨下

下述何种药物可引起中毒性心肌炎（）

A.利多卡因

B.青霉素

C.消炎痛

D.环孢素

E.阿霉素

用所给单词的适当形式填空。

1. I'm hoping the weather _____ (be) nice in the mountains.

2. _____ (listen) to the teacher carefully in class, please.

3. Doctor, I _____ (not feel) well now.

4. They _____  (plan) to go hiking yesterday.

5. It's bad weather. You'd better _____ (not go) there today.

6. They ______ (visit) Hong Kong next week.

7. Mike ______ (not do) his homework on Sundays.

8. Shall we go bike ______ (ride) this afternoon?

9．She's got a cold. She should ______ (have)a good rest.

10. They went ______ (camp) in the mountains last year.

硫磺生产的伴热蒸汽压力是多少及其原因是什么？

我国低压供电电压单相为220V，三相线电压为380V，此数值指交流电压的（）

A．平均值

B．最大值

C．有效值

D．瞬时值

强固扣合法适用于恢复壁厚（）～40mm一般强度要求的零件。

A.20

B.15

C.12

D.8