对于移相电容器来说，必须能在（）倍额定电压下长期运行。
A.1.05
B.1.1
C.1.15
D.1.2
参考答案：A
E-shopping, when properly _____, can save us a lot of time and money. [ ]
A. doing
B. to do
C. having done
D. done
原始社会的习惯就是习惯法。（）
