—What sentence element does the underlined part serve as? —It's important to stick to it and work hard towards it. A . Subject(主语) B . Object(宾语) C . Adverbial(状语) D . Attributive(定语) 答案:A关于物体对水平支持物的压力N,下列说法正确的是( )?? A.N就是物体的重力?? B.N是物体重力的平衡力?? C.N的作用点在物体上?? D.N的作用点在支持面上?