励磁电流I和线圈匝数X的乘积()
A.磁动势
B.电动势;
C.感应电势
参考答案:C
— What did you do _________ Saturday night?
— I _________ TV at home. [ ]
A. on…watched
B. on…watch
C. at…watched
D. in…watched
I stopped laughing when I realized my father was ________ about it. [ ]
A. crazy
B. serious
C. careful
D. special