交流电流表和电压表的测量值是（）
A.最大值
B.平均值
C.有效值
D.瞬时值
参考答案：C
The cars in the auto show vary ______ price from $ 100,000 ______ $ 2 million, but they have attracted many customers.
A．in; to
B．with; and
C．of; with
D．from; to
抢救青霉素过敏性休克的首选药物( )。
A．去甲肾上腺素
B．肾上腺素
C．多巴胺
D．肾上腺皮质激素
E．抗组胺药
