提出“内伤脾胃，百病由生”的医家是
A．刘完素B．张从政C．张元素D．李东垣
参考答案：D
----- Did you go to Sam's weekend party?
----- No, I ______________.
A．am not invited
B．wasn't invited
C．haven't invited
D．didn't invite
对于短小工件，不能用手捏住或者钻大于（）以上的孔的工件，必须用手虎 钳或小型虎钳夹持工件。
A.6mm
B.7mm
C.8rnm
D.9mm
