如图所示的实验原理、方法、装置和操作正确的是[ ]
A.
B.
C.
D.
答案:B
- -Could you tell me ?
--Sorry, I don't know .I was not at the meeting.
A.what does he say at the meeting
B.what did he say at the meeting
C.what he says at the meeting
D.what he said at the meeting
请用不,超过150字的篇幅,概括出给定资料所反映的主要问题。