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A．错误
B．正确

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地下水污染的特征是（）？ A. 隐蔽性 B. 难以逆转性 C. 延缓性 D. 污染土壤

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The main characteristics of a piston engines include: ____.

A．More efficient when flying at low speed
B．Are direct reaction engines
C．When the aircraft's flight speed exceeds 700-800 kilometers per hour, the propulsion efficiency will also drop sharply
D．Widely used in some small and low-speed aircraft