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11、14864 SPAN.CharChar1FONT-FAMILY: 宋体DIV.MyFav_1244188114864 SPAN.CharCharFONT-FAMILY: 宋体DIV.MyFav_1244188114864 DIV.Section1page: Section1一、选择题题号123456789101112选项DDBDABDABCDC二、填空题13310822014大 长度15可 机械能 电磁感应16费力 力的作用是相互的17速度 变小1810 下沉 变大192025 7.810-520光屏中央 放大 远离21右 24 10 2.4 绳子有体积22A 亮 7.5 1.35三、解答题2
12、3-25略26（1）200（2）2.1107（3）1.2527（1）4000J（2）80%（3）83.3w28(1)30(2) 0.05A (3)0.6W29(1)1、3 物体下落的快慢与材料无关(2)不等 纸所受的阻力相对于纸的重力不能忽略30（1）略（2）A （3）串联电阻的总电阻等于各电阻之和 （4）D （5）改变电路中的电流31(铁板的)重力；大(每空1分，共2分)(1)将八个风力板的迎风面(1分)朝南放置(1分)(2)每天结束时(1分)，以倾倒风力板中记录风力最大的作当天最强风力(1分)32（1）R=600-6（2）30o(3)串联一滑动变阻器滑动变阻器调大，启动温度变高；滑动变阻器调小，启动温度变低。