内区为何保持在微过量氧下操作?
参考答案:外区将在化学当量或亚化学当量情况下操作。内区需要在外区释放出的挥发份燃烧来放区。因此在内区,煅烧炉处于微过量氧情况下操作。
用所给动词的适当形式填空。
1. Does she like (make) noodles?
2. My father (work) in a store.
3. He (meet ) his friends now.
4. I don't like (work) in a bank.
5. Did you (come) here by bus?
6. Bob (go) to Paris with his family last summer.
7. Lucy (not take) a computer course last month.
8. How (be) your vacation?
9. I (have) a terrible time.
10. What are you doing now? I (play) the guitar.
如果触电者心跳停止,有呼吸,应立即对触电者施行()急救。
A、仰卧压胸法
B、胸外心脏按压法
C、俯卧压背法