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1. |
What is the maximum velocity of tap water such that the flow causes low noise? |
A. | 0.2-0.3 m/s |
B. | 0.5-0.7 m/s |
C. | 1.0-2.5 m/s |
D. | 1.5-2.5 m/s |
Answer» C. 1.0-2.5 m/s | |