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14、av_1276412375908 SPAN.3CharFONT-WEIGHT: bold; FONT-FAMILY: 宋体DIV.MyFav_1276412375908 DIV.Section1page: Section1DIV.MyFav_1276412375908 OLMARGIN-BOTTOM: 0cmDIV.MyFav_1276412375908 ULMARGIN-BOTTOM: 0cm一、单项选择题题号12345678910答案BDBBDBBBBD二、填空题11减小空气阻力 15 52 30412聚变 裂变13低 大于142N15减小压强 增大摩擦 略16增加17增加 增加18不相同 等于三、作图题：略四、实验探究题20右 左 游码 右 水平 便于从杠杆上直接读出力臂的大小21C 接触面积无关 滑动摩擦力的大小与物体受到的压力大小有关1和5 4和622速度 木块前进距离的远近 速度 距离 阻力 做匀速直线运动23（1）实验步骤：在量筒内倒入适量的水，体积为V1将橡皮泥捏成空心状漂浮在水中，观察此时水的体积V2将橡皮泥捏成实心状沉在水中，观察此时水的体积V3（2）橡皮泥密度表达式：略五、计算题247107N 824104Pa 3104m251092106J 700W/m2911016J