1 . When the Mach number is between --------the flow is called supe-sonic flow.
- A. 1 and 6
- B. 4 and 6
- C. 2.5 and 4
- D. 1 and 2.5
- D. None
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পায়রা বন্দর কর্তৃপক্ষ (বিভিন্ন পদ) 06-11-2020
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