电动机或其开关安设地点附近20米内风流中瓦斯浓度达到()时,必须停止工作,切断电源,撤出人员,进行处理。
A、1.0%,
B、1.5%,
C、0.5%
参考答案:B
用词,短语或句子补全对话。
Jack: Good morning, doctor.
Doctor: 1. _______. 2. _______?
Jack: I'm not feeling well. I don't want to eat anything.
Doctor: 3. _______?
Jack: No, I don't have a fever.
Doctor: 4. _______ ?
Jack: Yes, I sleep very wcll at night.
Doctor: Let me examine (检查) you. 5. _______, you are too tired. You should rest a lot.
Jack: 6. _______, I will.
Doctor: Jack, follow my advice, and you will get well soon.
Jack: 7. _______ .
Doctor: You're welcome.
下列国名是根据发迹地定名的是()。
A.汉
B.周
C.元
D.明