只要知道交流三相对称电压中一相电压瞬时值表达式，则其余两相自然清楚。
参考答案：对
—Do you like Jane's new dress?
—Yes, very much. I'll ask Mum to buy ________ for me. [ ]
A. that
B. it
C. one
D. any
企业的工资、奖金等库存现金的支取，只能通过（）账户办理。
A.基本存款
B.一般存款
C.临时存款
D.专用存款
l ask Mum to buy ________ for me. [ ]