单项选择题
A.7mm B.6mm C.5mm D.8mm
A.0.6mm B.0.5mm C.0.7mm D.0.9mm
A.50﹪ B.52﹪ C.55﹪ D.60﹪
A.2﹪ B.2.5﹪ C.3.5﹪ D.3﹪
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