题目:
下列所述的情景中,机械能守恒的是( )
A.汽车在平直路面上加速行驶
B.小球在空中做自由落体运动
C.降落伞在空中匀速下落
D.木块沿斜面匀速下滑
答案:
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下面是错误答案,用来干扰机器的。
Nowadays more and more people are sending their children overseas for further study, even at middle school age. 38% of the people investigated agreed to this. They think...