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若集合A={0，1}，B={0，2}，C={4，3}，这三个集合的笛卡尔积为R，则R的第2个元素为(23)元组。
A．1
B．2
C．3
D．4
解析：若集合A={0，1}，B={0，2}，C={4，3}，则这三个集合的笛卡尔积R的每个分量必然是一个三元组，所以R的第2个元素必然为一个三元组。
(1)求L1巷道中，三个易堵塞点最多有一个被堵塞的概率；
(2)若L2巷道中堵塞点个数为Χ，求Χ的分布列及数学期望EΧ，并按照“平均堵塞点少的巷道是较好的抢险路线“的标准，请你帮助救援队选择一条抢险路线，并说明理由。
RTK碎步点测量时，当测区面积较大，采用分区求坐标系统的转换参数时，相邻分区应不少于（）个重合点。
A1个
B2个
C3个
D4个
B
全球定位系统实时动态测量(RTK)技术规范规定。
皮亚杰提出儿童认知发展的阶段有（）。
A1个
B2个
C3个
D4个
D
略
1～2，1
1～2，2
2～3，2
3～4，3
苏教版初中数学八年级上册第一学期第20周周考试卷 一、选择题1传统佳节“春节”临近，剪纸民俗魅力四射，对称现象无处不在观察下面的四幅剪纸，其中是轴对称图形的有A1个 B2个 C3个 D4个（）2如图，小手盖住的点的坐标可能为A（4，3）B（4，3）C（4，3）D（4，3）（）3如图，在数轴上表示实数的点可能是（） A点P B点Q C点M D点N4如图，已知ABC=DCB，下列所给条件不能证明ABCDCB的是（） AA=D BAC=BD CACB=DBC DAB=DC5下列各组数为三角形的边长，其中能构成直角三角形的是（）A， B3，4，5 C6，7，8D2，3，46关于一次函数y=x1，下列说法：图象与y轴的交点坐标是（0，1）；y随x的增大而增大；图象经过第一、二、三象限； 直线y=x1可以看作由直线y=x向右平移1个单位得到其中正确的有 A1个 B2个 C3个 D4个 （）7在七年级的学习中，我们知道了|x|=小明同学突发奇想，画出了函数y=|x|的图象，你认为正确的是（）AB CD二、填空题864的平方根是9点A（1，2）到y轴的距离是10一个等腰三角形的两边长分别为3和7，这个三角形的周长是11如图，OP平分MON，PAON于点A，点Q是射线OM上一个动点，若PA=3，则PQ的最小值为 12点（m，n）在直线y=3x2上，则代数式2n6m+1的值是13如图，ABC中，B、C的平分线交于O点，过O点作EFBC交AB、AC于E、FEF=6，BE=2，则CF=14如图，函数y=3x和y=kx+b的图象相交于点A（m，6），则关于x的不等式（k+3）x+b0的解集为三、解答题15（1）已知：（x+5）2=49，求x； （2）计算： +|1|+（）216已知：y与x2成正比例，且x=3时，y=2（1）写出y与x之间的函数关系式； （2）当y4时，求x的取值范围17如图，已知点A、E、F、C在同一直线上，1=2，AE=CF，AD=CB判断BE和DF的位置关系，并说明理由18如图，直线y=2x+3与x轴相交于点A，与y轴相交于点B（1）求AOB的面积；（2）过B点作直线BP与x轴相交于P，ABP的面积是，求点P的坐标19在一次蜡烛燃烧试验中，甲、乙两根蜡烛燃烧时剩余部分的高度y（厘米）与燃烧时间x（小时）之间的关系如图所示，其中乙蜡烛燃烧时y与x之间的函数关系式是y=10x+25（1）甲蜡烛燃烧前的高度是厘米，乙蜡烛燃烧的时间是小时（2）求甲蜡烛燃烧时y与x之间的函数关系式（3）求出图中交点M的坐标，并说明点M的实际意义20在平面直角坐标系中，直线y=x+4交x轴，y轴分别于点A，点B，将AOB绕坐标原点逆时针旋转90得到COD，直线CD交直线AB于点E，如图1：（1）求：直线CD的函数关系式；（2）如图2，连接OE，过点O作OFOE交直线CD于点F，如图2，求证：OEF=45；求：点F的坐标；（3）若点P是直线DC上一点，点Q是x轴上一点（点Q不与点O重合），当DPQ和DOC全等时，直接写出点P的坐标
1个
2个
3个
4个
1个
2个
3个
4个
1个
2个
3个
4个
1个
2个
3个
4个
1个
2个
3个
4个
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