血液在脉中正常运行的3个基本条件是（）
A.心气充沛
B.脉道的畅通
C.神志正常
D.三焦通利
E.血液充盈
参考答案：A, B, E
加工中心机床就是把几台数控机床集中在一起组成一个机械加工中心。( )
—Listen! Kathy is playing the piano in the next room.
—It ______ not be Kathy. She called me on the way to the post office just now. [ ]
A. can
B. must
C. need
D. shall
