单项选择题
A.600mm B.700mm C.800mm D.1000mm
A.50% B.60% C.65% D.70%
A.2016.10.1 B.2017.1.1 C.2017.5.1 D.2017.6.1
A.16100mm B.17100mm C.18100mm D.19100mm
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