题目

如图所示为一横波在某一时刻的波形图,已知质点F此时的运动方向如图所示,则(    )        A.该横波向右传播       B.质点H的运动方向与质点F的运动方向相同       C.质点C比质点B先回到平衡位置       D.质点C在此时的加速度为零 答案:C - Dad, can I have _________ to eat? I’m hungry.- Sorry, there is _________ in the fridge. Can you go downstairs to buy some food?A. anything; nothing B. something; noneC. something; nothing D. anything; none
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