风寒咳嗽宜选用
A．葱豉桔梗汤B．桑菊饮C．止嗽散D．荆防败毒散E．参苏饮
参考答案：C
―Excuse me, Sir, but could you tell me how to go to the railway station?
―Sorry. You’d better ask, I’m afraid, ______ is a native.
A．whom
B．who
C．whomever
D．whoever
直流电动机中电枢绕组流过的电流为（）。
A.直流
B.交流
C.脉冲
