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下表是部分知识的归纳,其中正确的一组是( )
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下列说法中①一组对边平行另一组对边相等的四边形是平行四边形②一组对边平行一组对角相等的四边形是平行四
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善于归纳知识利于培养素质.下面是某同学对部分化学知识的归纳其中有不正确的一组是
A
B
C
D
下面是小青同学对部分化学知识的归纳其中正确的一组是
实验记录:①用10mL量筒量取7.025mL水;②用托盘天平称取5.6g氯化钠
安全常识:①酒精灯打翻起火,用湿抹布扑灭;②冬天用煤炉取暖,应保证室内通风
化学与健康:①人体缺维生素A.会引起夜盲症;②禁止使用任何食品添加剂
化学与生活:①用钢丝球擦洗铝锅上的污垢;②用食醋除水垢
下表是部分知识的归纳其中正确的一组是
A
B
C
D
下表是部分知识的归纳其中正确的一组是
A
B
C
D
如表是部分知识的归纳其中正确的一组是
A
B
C
D
以下是对某一主题知识进行的归纳其中完全正确的一组是
化学与能源
环保与物质的利用
化学与材料
元素与人体健康
下表是部分知识的归纳其中正确的一组是
小张将我国历朝的制度创新归纳成下表请判断表中内容正确的一组是
①③④
①②③
①②④
②③④
如表是部分知识的归纳其中正确是一组是
A
B
C
D
有下列说法①只有一个物体也会产生力的作用②只有相互接触的物体才有力的作用③力可以改变物体的运动状态④
①②
③④
①③
②④
如表是部分知识的归纳其中正确的一组是
A
B
C
D
下图是等压线分布示意图其中正确的一组是
①④
②③
①③
②④
下表是部分知识的归纳正确的一组是
A
B
C
D
下面是某同学用连线的方式对某一主题知识进行归纳的情况其中正确的是
性质与用途
名称与俗名
生活常识
环保与物质的利用
下面是小青同学对部分化学知识的归纳其中正确的一组是
实验记录:①用10mL量筒量取7.02mL水; ②用托盘天平称取5.6g氯化钠
安全常识:①酒精灯打翻起火,用湿抹布扑灭; ②冬天用煤炉取暖,应保证室内通风
化学与健康:①人体缺维生素A.会引起夜盲症; ②禁止使用任何食品添加剂
化学与生活:①用钢丝球擦洗铝锅上的污垢; ②用食醋除水垢
如表是部分知识的归纳其中正确是一组是
A
B
C
D
下表是部分知识的归纳其中正确的一组是
A
B
C
D
下表是对部分知识的归纳其中完全正确的一组是
A
B
C
D
下面是有关操作系统的叙述其中正确的是______
操作系统是一组存储管理程序
操作系统是一组中断处理程序
操作系统是一组资源管理程序
操作系统是一组文件管理程序
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在平面直角坐标系中以原点为极点以x轴非负半轴为极轴建立极坐标系已知曲线C的极坐标方程为ρ2=2ρcosθ﹣4ρsinθ+4直线l1的极坐标方程为ρcosθ﹣sinθ=3. Ⅰ写出曲线C和直线l1的直角坐标方程 Ⅱ设直线l2过点P﹣10与曲线C交于不同两点ABAB的中点为Ml1与l2的交点为N求|PM|•|PN|.
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已知函数fx=xlnx﹣x2﹣ax+1a>0函数gx=f′x. 1若a=ln2求gx的最大值 2证明fx有且仅有一个零点.
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某商店销售某海鲜统计了春节前后50天该海鲜的需求量x10≤x≤20单位公斤其频率分布直方图如图所示该海鲜每天进货1次商店每销售1公斤可获利50元若供大于求剩余的削价处理每处理1公斤亏损10元若供不应求可从其它商店调拨销售1公斤可获利30元.假设商店每天该海鲜的进货量为14公斤商店的日利润为y元. Ⅰ求商店日利润y关于需求量x的函数表达式 Ⅱ假设同组中的每个数据用该组区间的中点值代替. ①求这50天商店销售该海鲜日利润的平均数 ②估计日利润在区间[580760]内的概率.
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在四面体ABCD中AB=4BC=CD=3AC=5且AB⊥CD当四面体ABCD的体积最大时其外接球的表面积为
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设函数y=fx的定义域为I则“fx在I上的最大值为M”是“∀x∈Ifx≤M”的
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在直三棱柱ABC﹣A1B1C1中已知AB⊥BCAB=BC=2则异面直线AC1与A1B1所成的角为
已知抛物线y2=2pxp>0直线y=x+2是它的一条切线. 1求p的值 2若A24过点pm0作动直线交抛物线于BC两点直线AB与直线AC的斜率之和为常数求实数m的值.
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在△ABC中AB=AC=3AD=2△ABC的面积为则∠ADB=
函数fx=tanx﹣x3的部分图象大致为
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已知一个圆柱的轴截面是面积为36的正方形则这个圆柱的侧面积为
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