Mr Bean, is a kind of _______. [ ]
A.thrillers
B.documentaries
C.comedies
答案:C
You can’t take the lift because it is _______.
A.in order
B.in order to
C.out of order
D.on order
A.电流表的示数为3/11 A
B.通过灯泡的电流的频率为50Hz
C.电流表的示数为3/22 A
D.理想变压器原、副线圈匝数之比为2:1