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一、选择题: 1.设P={3,4,5},Q={4,5,6,7},定义P米Q一{(a,b)一a〔P,beQ},则P浓Q中元素的个数是(). A.3B.4 C. 7 D.12 2.下列四个图形中,与函数y一3十logZx(x)1)的图象关于直线y~x对称的是().厂y︸请下载后查看，本文暂不支持在线获取查看简介。请下载后查看，本文暂不支持在线获取查看简介。~一,互…!_ 3.已知等差数列{a二)的通项公式为a,一Zn+1,其前n项和为S,,则数列
First, multiple-choice questions: 1. Let P={3,4,5},Q={4,5,6,7}, define P-meter Q{a,b)-a[P,beQ}, then The number of elements in the P-rich Q is (). A.3B.4 C. 7 D.12 2. In the following four graphs, the image of the function y -3 log 10 logZx(x)1) is on the straight line y~ X symmetry is (). Factory y} Please download and view, this article does not support online access to view profile. Please download and view, this article does not support online access to view profile. ~ One, mutual...!_ 3. The general formula of the known arithmetic sequence {a2) is a, a Zn+1, and the first n terms are S, then the sequence