單項(xiàng)選擇題

室內(nèi)發(fā)現(xiàn)燃?xì)庑孤叮瑧?yīng)立即關(guān)閉閥門,不能()

A.開燈
B.打手機(jī)
C.開排氣扇
D.開窗
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The acceleration due to gravity is essentially constant.

答案: The acceleration due to gravity is essentially constant when...
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