题目

— I hear you're going to the city. — Yes. Anyway, life in the city is quite different from ______ in the country. A . one B . those C . that D . what 答案：C如图所示，重为4牛的物体浸没在水中时，弹簧测力计的示数是3牛，物体受到的浮力为 牛。若逐渐增加物体在水中的深度，则物体下表面受到水的压强 ，物体受到水的浮力 。(后二空选填“变小”、“不变”或“变大”)