题目

 You should take more exercise. It’s good ______ your health.              A. at                            B. with                  C. for                    D. to 答案：C（1）如图1，画出静止在水面物体受力的示意图（2）请在图2中画出物体受到重力G=30N和物体对斜面的压力F=20N 的示意图