制定需要矿山救护队执行的()等安全技术工作的安全措施时,矿山救护队必须参加。
A.排放瓦斯
B.井下烧焊
C.震动爆破
D.反风演习
E.巷道贯通
参考答案:A, C, D
根据所给情景,选出最适合的一项,请将标号写在题前括号中。
1. [ ]
A. Who are you?
B. What are you?
C. How are you?
D. Is that Jane speaking?
2. 当老师问“Is everyone here today?”时,哪种回答才对?[ ]
A. Yes, we do.
B. Yes, I am.
C. No, Tom is not here.
D. I am on duty today.
3. [ ]
A. What is she doing?
B. How is she?
C. Where is she?
D. How old is she?
4. Tom: Where is my bike?
Sherry: Is it a green one?
Tom: Yes, it is.
Sherry: Look. _____________
Tom: Yes. Thank you very much.[ ]
A. Is that one?
B. Here you are.
C. I don't know.
D. What is that?
5. — How are you?
— ______________.[ ]
A. It's fine
B. It is loudly
C. It is rainy
D. I am fine
光电效应中,光电流的强度与()有关
A.入射光的强度
B.光照射的时间
C.入射光的频率
D.响应时间