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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

Why does the author suggest that the experiments with the wind tunnel were important? Because-

A. they allowed the Wright brothers to decrease the weight of their airplane to acceptable limits.
B. they resulted in a three-axis control for their airplane.
C. they were important in the refinement of the wings for their airplane.
D. they used the data to improve the engine for their airplane.
সঠিক উত্তরঃ C. they were important in the refinement of the wings for their airplane.
Explanation: