force可数吗书上说的是a force that keeps us from floating in the the air.这么说可数啦?

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force可数吗书上说的是a force that keeps us from floating in the the air.这么说可数啦? force force force 解词： force a contract Force-A-Nature a labor force 是一个劳动大军 、labor force是劳动力? a force of gravity 这个短语中的force 不是不可数吗? The direction a force acts can be The direction __D____ a force acts can be changed.C.towards D.×答案是选D.a force acts the direction, She is a silly force What kind of force is the force on the student by the backpack?A gravitational force.A nuclear force.An electromagnetic force.三个选项 选哪个? the army,navy and air force这里的force为什么不用复数?这不是三军吗？三不是复数吗？ force majeure force?翻译 by force force是什么意思 Force意思 force 是什么意思?