계산 문제
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배관의 규격은 φ108×4이며, 유체의 유량은 시간당 150입방미터입니다. 그렇다면 유속은 ( )m/s가 됩니다. A、 5.408 B、 5.308 C、 4.907 D、 4.551B φ108×4는 무슨 뜻인가요? 어떻게 계산된 건가요?
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