单项选择题
A.30~70mmB.100~140mmC.200~300mmD.50~70mm
A.30~70mmB.10~40mmC.20~40mmD.10~30mm
A.1200mmB.1500mmC.1800mmD.1000mm
A.勒脚B.踢脚线C.基础D.地基
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