There are a lot _____ people today than yesterday. [ ]
A. of
B. /
C. most
D. more
答案:D
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
船厂电工在油漆间内安装了舱顶灯和水密开关以提供必要的照明,请指出错误之处。