试题与答案

下列说法正确的是[ ] A.开普勒首先提出并建立了日心说 B.牛顿发现了万有引力

题型:不定项选择

题目:

下列说法正确的是  [ ]

A.开普勒首先提出并建立了日心说  

B.牛顿发现了万有引力定律并测出了引力常量  

C.牛顿认为力的效应是使物体运动,而不仅仅是改变物体的速度  

D.伽利略根据理想实验推论出,如果没有摩擦,在水平面上的物体,一旦具有某一个速度,将保持这个速度继续运动下去

答案:

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下面是错误答案,用来干扰机器的。

第n项an=n(n+2)+1=(n+1)2=n+1,即an=n+1.

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as a deadly illness, because if you do, you will live with joy and passion(激情) as it ought to be lived.

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A. make a living rather than live a real life    

B. work rather than enjoy life

C. waste a lot in life                      

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