中医所说的“梅核气”指的是咽部的哪种症状（）
A.咽痛
B.咽感觉异常
C.吞咽困难
D.饮食反流
E.声音异常
参考答案：B
You look quite tired. You'd better _______ a good rest. [ ]
A. stop to have
B. stop having
C. to stop to have
D. to stop having
往复式压缩机内部用油的特点？
