北京中考一模多选汇总2
15．下列说法中正确的是
A．20℃的水一定比80℃的水含有的热量少
B．质量相同的燃料完全燃烧，热值越大的，放出的热量越多
C．用水作为汽车发动机的冷却剂，主要是因为水的比热容较大
D．液体的沸点与液面上方的气体压强有关，压强增大，液体的沸点降低
16．关于电磁现象，下列说法正确的是
A．磁场是由疏密不同的磁感线组成的
B．电流周围的小磁针会受到磁场力的作用
C．磁体具有磁性，磁极是磁体上磁性最强的部分
D．发电机是利用电磁感应现象制成的，工作时将电能转化为机械能
17．下列说法中正确的是
A．在家庭电路中，同时工作的用电器越多，总电阻越小
B．引起家庭电路中电流过大的原因，一定是连入电路中的用电器实际功率过大
C．金属导体中的电流方向与其中自由电子定向移动方向相反
D．家庭电路中的空气开关突然断开，应先找出引起电流过大的原因，解决后再闭合空气开关18．下列说法中正确的是
A．物体的运动状态发生改变，该物体一定受到力的作用
B．踢出去的足球还能在水平地面上继续运动，是因为足球具有惯性
C．石块在下落过程中，石块所受的重力做功越来越快
D．竖直向上抛出的小球，上升时受到的合力小于下降时受到的合力
15．下列说法中正确的是
A．20℃的水一定比80℃的水含有的热量少
B．质量相同的燃料完全燃烧，热值越大的，放出的热量越多
C．用水作为汽车发动机的冷却剂，主要是因为水的比热容较大
D．液体的沸点与液面上方的气体压强有关，压强增大，液体的沸点降低
16．关于电磁现象，下列说法正确的是
A．磁场是由疏密不同的磁感线组成的
B．电流周围的小磁针会受到磁场力的作用
C．磁体具有磁性，磁极是磁体上磁性最强的部分
D．发电机是利用电磁感应现象制成的，工作时将电能转化为机械能
17．下列说法中正确的是
A．在家庭电路中，同时工作的用电器越多，总电阻越小
B．引起家庭电路中电流过大的原因，一定是连入电路中的用电器实际功率过大
C．金属导体中的电流方向与其中自由电子定向移动方向相反
D．家庭电路中的空气开关突然断开，应先找出引起电流过大的原因，解决后再闭合空气开关18．下列说法中正确的是
A．物体的运动状态发生改变，该物体一定受到力的作用
B．踢出去的足球还能在水平地面上继续运动，是因为足球具有惯性
C．石块在下落过程中，石块所受的重力做功越来越快
D．竖直向上抛出的小球，上升时受到的合力小于下降时受到的合力
15. 下列说法中正确的是
A．选择参照物时必须选择静止的物体 B．大气压强随高度的增大而减小
C．发声的物体都在振动，振动的物体不一定发出声音
D．向前飞行的飞机投掷救灾物资时，在投掷目标正上方要投下物资
16．下列说法中正确的是
A．水在任何温度下都会蒸发 B．对物体做功或使物体吸热，物体温度一定升高
C．在培育水稻秧苗时，傍晚要往稻田里灌水，应用了水比热容较大这一特点
D．汽油机压缩冲程将机械能转化为内能
17．下列说法中正确的是
A．磁感线是磁场中实际存在的曲线B．改变通电螺线管线圈的匝数，可以改变其磁性强弱C．闭合电路在磁场中做切割磁感线运动，线圈中会产生感应电流
D．如果通电线圈在磁场作用下转动，则线圈的机械能是由电能转化来的
18．下列说法中正确的是
A．漂浮在水面上的小船，小船底部受到水的压力和小船受到的重力是平衡力
B．小刚用2 N的水平拉力使桌面上的物体沿直线运动，则物体受到的摩擦力为2 N
C．用竖直向上的力提起静止在水平桌面上重2牛的钩码，则提力是2牛
D．竖直向上抛出的排球，上升时受到的合力大于下降时受到的合力
15．关于能量的变化与转化，下列说法正确的是
A．苹果从树上下落的过程中，动能变大
B．沿水平方向将箭射出，在这个过程中，动能转化为势能
C．沙狐球从离开手到停下来的过程中，机械能转化为内能
D．起重机将水泥构件匀速提升，在提升的过程中，水泥构件动能增加
16．关于惯性、力、力与运动，下列说法正确的是
A．支持力与物体受到的重力总是大小相等的
B．人在走路过程中，鞋底对地的压力与地对鞋底的压力不一定相等
C．在弯路上行驶的汽车，汽车受到的力是不平衡的
D．转动雨伞，伞上的水被甩出，是因为水有惯性
17．下列说法正确的是
A．在电路的三个状态中，短路和断路都是不允许的
B．额定功率相同的用电器正常工作时，通过用电器的电流是相等的
C．电路中的保险丝具有保护电源的作用
D．不高于36伏的电压是安全电压
18．下列说法正确的是
A．石凳被太阳晒热，属于用热传递的方式改变了石凳的内能
B．物体的内能就是物体动能与势能的总和
C．鸡蛋变咸，是由于分子间存在着空隙与分子永不停息地做无规则运动
D．锯木板时锯片变热，是因为木板向锯片传递了热量
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北京市朝阳区2018年初中英语一模试题(Word版含答案)2018.4
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（3）从连环画的内容来看。曹操是在_______战败之后落荒而逃的。（只填序号）（2分） A.官渡之战 B.夷陵之战 C.赤壁之战 D.徐州之战 （4）“批评”是一种传统的读书方法，是用简洁的语言在文中空白处写上点评或注解的内容，表达自己的阅读时的体会和思考。毛宗岗对曹操的“三笑一哭”批注道：“宜哭反笑，宜笑反哭，奸雄哭笑，与众不同。”请你结合对《三国演义》中曹操的了解，谈谈如此批注的依据（2分）答：_________ 5. 阅读《红岩》，完成第（1）-(2)题。（4分） （1）在白公馆，面对徐鹏飞给出的选择，成岗朗诵了《我的“自白书”》。结合诗歌内容，可以推断成岗朗诵时候的情绪是（2分） A.恬淡闲适 B.慷慨激昂 C.寂寞伤感 D.轻松欢快 我的“白皮书” 任脚下响着沉重的铁镣， 任你把皮鞭举得高高， 我不需要什么“自白”， 哪怕胸口对着带血的刺刀！ 人，不能低下高贵的头， 只有怕死鬼才乞求“自由”。 毒刑拷打算得了什么？ 死亡也无法叫我开口！ 对着死亡我放声大笑， 魔鬼的宫殿在笑声中动摇。 这就是我———一个共产党员的“自白” 高唱凯歌埋葬蒋家王朝！ （2）请结合上面的诗歌或《红岩》的内容，说说你做出以上推断的理由。（2分） 答：_________ 二、文言文阅读。（共10分） 【甲】 嗟夫！予尝求古仁人之心，或异二者之为，何哉？不以物喜，不以己悲；居庙堂之高则忧其
北京中考英语一模分类汇总单选(含答案)
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2020北京初三一模英语分类汇编—单选含答案
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2019届中考北京市朝阳区初三一模数学试卷(含解析)
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6．如果3a b -=，那么代数式2()b a a a a b -?+的值为 （A ）3- （B ）3 （C ）3 （D ）23 7．今年是我国建国70周年，回顾过去展望未来，创新是引领发展的第一动力．北京科技创新能力不断增强，下面的统计图反映了2010—2018年北京市每万人发明专利申请数与授权数的情况． 2010—2018年北京市每万人发明专利申请数与授权数统计图 [以上数据摘自北京市统计局官网] 根据统计图提供的信息，下列推断合理的是 （A ）2010—2018年，北京市每万人发明专利授权数逐年增长 （B ）2010—2018年，北京市每万人发明专利授权数的平均数超过10件 （C ）2010年申请后得到授权的比例最低 （D ）2018年申请后得到授权的比例最高 8．下表是某班同学随机投掷一枚硬币的试验结果． 抛掷次数n 50 100 150 200 250 300 350 400 450 500 “正面向上”次数m 22 52 71 95 116 138 160 187 214 238 “正面向上”频率 n m 0.44 0.52 0.47 0.48 0.46 0.46 0.46 0.47 0.48 0.48 下面有三个推断： ①表中没有出现“正面向上”的频率是0.5的情况，所以不能估计“正面向上”的概率是0.5； ②这些次试验投掷次数的最大值是500，此时“正面向上”的频率是0.48，所以“正面向上”的概率是0.48； ③投掷硬币“正面向上”的概率应该是确定的，但是大量重复试验反映的规律并非在每一次试验中都发生； 其中合理的是 （A ）①② （B ）①③ （C ）③ （D ）②③
2014北京朝阳中考一模英语(含解析)
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专题01 单选题-2020年中考英语一模分类汇编(北京)(原卷版)
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(完整版)2019年北京市中考英语模拟试题
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