单项选择题
A.针孔B.粉化C.脱落D.不固化
A.1/4-1/3B.1/3-1/2C.1/2-2/3D.2/3-3/4
A.5B.10C.15D.20
A.50-70B.70-90C.90-110D.110-130
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