北京（40°N，116°E）天安门广场上的国旗与日同升，3月21日天安门

北京（40°N，116°E）天安门广场上的国旗与日同升，3月21日天安门广场的升旗时刻是北京时间（）

A．6时整　　　 B．5时44分

C．6时16 分　　　 D．6时04分

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北京（40°N，116°E）天安门广场上的国旗与日同升，3月21日天安门

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