路程与时间成正比例。 [ ]
错误
. The _____ look on his face suggested that it was he who had broken into the house.
A．fright
B．frightened
C．frighten
D．frightening
A．通过改变橡皮筋的条数改变拉力做功的数值
B．通过改变橡皮筋的长度改变拉力做功的数值
C．通过打点计时器打下的纸带来测定小车加速过程中获得的最大速度
D．通过打点计时器打下的纸带来测定小车加速过程中获得的平均速度
