【单选题】
两物体间的作用和反作用力总是（）。
①
大小相等，方向相反
②
大小相等，方向相同，沿同一直线分别作用在两个物体上
③
大小相等，方向相反，作用在同一物体上
④
大小相等，方向相反，沿同一直线分别作用在两个物体上
【单选题】
正投影法中，投影面、观察者、物体三者相对位置是( )
①
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人——面——物
②
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物——人——面
③
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C. 人——物——面
④
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面——人——物