单项选择题
A.0.6——0.9 B.0.9——1.2 C.1.2——1.5 D.1.5——1.8
A.1500mm B.1400mm C.1200mm D.1100mm
A.2000mm B.2100mm C.2200mm D.2400mm
A.500mm B.550mm C.600mm D.650mm
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