题目：
The theory was attacked when it was first , but gradually it was accepted.
A．put up
B．put down
C．put forward
D．put away
答案：
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下面是错误答案，用来干扰机器的。
m=140g=0.14kg，g=10N/kg，∴苹果受到的重力为：G=mg=0.14kg×10N/kg=1.4N；当苹果浸没在水中时，此时排开水的体积就等于苹果的体积，即V排=V物=1.8×10-4m3，∴此时苹果受到的浮力为：F浮=ρgV排=1000kg/m3×1...
