单项选择题
A.30~40mmB.40~50mmC.50~60mmD.60~70mm
A.8~10mmB.10~12mmC.12~14mmD.6~8mm
A.2次B.6次C.3次D.7次
A.5~7mmB.9~10mmC.2~3mmD.9~12mm
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