单项选择题
A.5cmB.10cmC.15cmD.20cm
A.10cmB.20cmC.30cmD.40cm
A.1.2mB.1.3mC.1.4mD.1.5m
A.地锚瓣和铁柄B.横木和拉线盘C.铁柄和拉线盘D.拉线盘
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