公元6世纪，吴人知聪携带到日本的著作是（）
A.《内经》
B.《针灸甲乙经》
C.《明堂图》
D.《针经》
E.《十四经发挥》
参考答案：B, C
目前酸雨观测站使用的pH计的测量原理为________。
A．电阻法
B．温差法
C．电位法
- -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
