积的辨证原则可根据临床病程分为
A．早期
B．初期
C．中期
D．末期
E．晚期
参考答案：A,C,D
I hate ______ their complains all day. one of these days I’ll tell them what I really think.
A．paying attention to
B．to talk about
C．listening to
D．to have heard
钻铤壁厚一般为（）mm。
A.6~8
B.9~11
C.12~14
D.14~16
