煤水分的高低决定了焦炭水分的高低。
参考答案：错
I suppose that when I come back in two year’s time all these old houses will ____ down．
A．have pulled
B．be pulling
C．have been pulled
D．be pulled
A．动能减少，势能减少
B．动能增加，势能增加
C．动能减少，势能增加
D．动能增加，势能减少
