交流电正弦量的三要素指的是（）。
A、电压、电流、电阻；
B、电压、频率、相序；
C、幅值、频率、初相位；
D、幅值、频率、相序。
参考答案：C
Some students in Shanghai ______ e-bags for several months. [ ]
A. will have
B. have
C. have had
D. had
一个数除以分数，商大于被除数。[ ]
