单项选择题
A.15~20mm B.20~25mm C.25~30mm D.30~35mm
A.1.0mm B.1.2mm C.1.5mm D.2.0mm
A.10~15mm B.15~20mm C.20~25mm D.25~30mm
A.100％；7B.90％；7C.100％；5D.90％；5
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