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【简答题】
有一质量为 2 t 的汽车,它的发动机的额定功率为 20kW ,汽车在公路上从静止开始运动,在发动机的输出功率小于额定功率时,设法保持牵引力恒为 2×10 3 N ,汽车所受阻力恒为 1×10 3 N ,求: ( 1 )保持牵引力不变时的时间? ( 2 )汽车运动的最大速度多大。
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举一反三
【单选题】Which of the following is right about the silk road? ( )
A.
Zhang Qian and BanChao in Han Dynasty set out two journeys to the Western Regions.
B.
The ancient silk road spent its childhood and gradually grew up in Zhou dynasty.
C.
Tang Dynasty saw the silk road rise to its most flourishing period in history.
D.
The ancient silk road declined gradually in the Yuan Dynasty.
【简答题】营销分析系统,通常由 、统计库和模型库三部分组成。
【单选题】Which of the following is right about the silk road? ( )
A.
Zhang Qian and BanChao in Han Dynasty set out two journeys to the Western Regions.
B.
The ancient silk road spent its childhood and gradually grew up in Zhou dynast.
C.
Tang Dynasty saw the silk road rise to its most flourishing period in history.
D.
The ancient silk road declined gradually in the Yuan Dynasty.
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