慢性失眠是指病程在()
A.15天以上
B.1个月以上
C.2个月以上
D.3个月以上
E.6个月以上
参考答案:E
How long have you______? [ ]
A. married
B. be married
C. got married
D. been married
用电流表测得的交流电流的数值是交流电的( )。
A.有效值
B.瞬时值
C.最大值