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38、分，选对但选不全的得2分，选错或不选的得0分，共29分）题号12345678910111213答案ACCBDBADAAABDABCACD二、填空题（本题共13小题，每小题2分，共26分）14红外线 无规则的运动（热运动）15光的直线传播 振动16如：运动需要力来维持吗？足球被踢出去后，并没有受到向前方向的力，但它仍能向前飞行很远，这足以说明运动并不需要力来维持。17做功 减小18这是急刹车时可能出现的情况，并非是启动时的情况。系安全带、不准超速193108151042049106不变21增大 222蒸发 液化23吸 内能24做功 减小25水 比热容26杠杆平衡 阿基米德原理三、作图与实验探究题
39、（本题4小题，共22分）27（4分）略 评分标准：每图2分，共4分28（4分）空玻璃杯漂浮在水面上时量筒的示数（ml）将水晶球放入玻璃杯中量筒内水面示数（ml）水晶球的体积（cm3）水晶球的密度（g/cm3）1060103评分标准：每空各1分，共4分。29（1）略；（2）计算三次电阻取平均值减小误差计算灯泡的额定功率和在不同电压下的功率，同时观察不同电压下灯泡的亮度 （3）05 19评分标准：每空（图）各1分，共5分。30（9分）（1）盐水的凝固点升高了 撒盐后变成了盐水，发现在相同的温度下盐水比水不易结冰（2）选二个相同的容器，并注入等量的水。只在其一容器中加适量的盐。同时送入冰箱冷冻一段时
40、间后，一起拿出来比较是否同时结冰。（3）在公路面上撒沙、炉渣等 增大摩擦（4）惯性 小 大评分标准：（1）（3）（4）小题，每空各1分，（2）2分。共9分。每空各1分，共4分。四、创新应用与计算题（本题3小题，共23分。要求写出必要的文字说明、单位，重要的公式及主要的运算过程，只写出结果的不能得分）31（8分）（1）168105J （2）27105J （3）560W （4）P电P额这说明电磁炉加热过程中，有大量的热损失了。评分标准：每小题2分，共8分。32（7分）（1）5m/s （2）125105Pa （3）约13333W评分标准：（1）（2）每小题2分，（3）小题3分。33（8分）（1）103kg/m3（2）评分标准：每小题4分，共8分。