信号工作人员在站（场）内和区间进行施工、检修作业时，应如何防护？
参考答案：
应设安全防护员，实行专人防护。
怔忡虚证的治疗大法当以下列哪项为主（）
A.滋补肝肾
B.培土生金
C.养血安神
D.补益心脾
E.温补脾肾
— Why didn't you tell him about the meeting?
— He had rushed out of the room ______ I could say a word. [ ]
A. before
B. until
C. when
D. after
