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【单选题】
现要输送 45m 3 / h 的水,若管内水的流速约取 2.5m/s ,则可选( )钢管。
A.
φ 76 × 3mm
B.
φ 88.5 × 4mm
C.
φ 108 × 4mm
D.
不确定
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相关题目：
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查看完整题目与答案