慢性对称性多关节炎多见于
A．风湿热
B．类风湿关节炎
C．血清阴性脊柱关节病
D．痛风
E．结核
参考答案：B
— Could I go to the movie this weekend, Dad?
— Yes, you _____ . But you have to come back before nine.
[ ]
A. would
B. could
C. can
D. must
大锤和手锤的锤头应完整，其表面应光滑微凸，不准有（）情形。
A.歪斜
B.缺口
C.凹入
D.裂纹
