单项选择题
A.DN100 B.DN65 C.DN50 D.DN40
A.-0.6m B.3.4m C.1.1mm D.14.8m
A.550mm B.1100mm C.1200mm D.0.6m
A.-0.7米 B.0.7米 C.1米 D.3.4米
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