单项选择题
A.20%和80%B.70%和30%C.60%和40%D.10%和90%
A.100:7:4B.100:6:5C.100:8:3D.100:9:5
A.裂痕B.刷痕C.干裂D.起泡
A.破裂B.起层C.粗糙D.流坠
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