耐水洗牢度的等级共分（）级。
A.5
B.6
C.8
D.9
参考答案：A
目前最常用和有效的胸壁内固定手术是（）
A.爪形肋骨固定架肋骨固定术
B.钢板固定
C.钢丝固定
D.克氏针内固定
E.缝扎固定
The teacher is coming. Please stop _____ and keep ____.[ ]
A. talking, quiet
B. talking, quite
C. to talk, quiet
D. to talk, quite
