影响刀具磨损扩散速度的最主要原因是切削（）。
A.方向
B.速度
C.力
D.温度
参考答案：D
A good story does not necessarily have to have a happy ending, but the reader must not be left _____.[ ]
A. unsatisfying
B. unsatisfied
C. to be unsatisfying
D. being unsatisfied
水痘病儿应隔离至：()
A．出疹后5天
B．部分皮疹结痂
C．出疹后10天
D．全部皮疹结痂
E．全部皮疹消退，结痂脱落
