单项选择题
A.1.2mB.1mC.900mmD.500mm
A.1.2m,180mmB.1m,160mmC.1.2m,160mmD.1m,180mm
A.150mmB.200mmC.300mmD.500mm
A.1.2mB.1.5mC.1.8mD.2m
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