浙江省嘉兴市2024-2025学年高三第一学期基础测试政治试题及答案

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4,B【解析】本题考查平面向量的数量积,考查运算求解能力因为(a-b)⊥(3a+2b),|b|=2a|,所以(a-b)·(3a+2b)=3a2-a·b-2b=-a·b-a2=0,所以a·b=-a2设a与b的夹角为,则cosa·b=2aba|·2因为0∈[0°,180°],所以0=135

9.C【命题意图】本题以有机物的结构为载体,考查官能团、结构特征、反应类型等,渗透了证据推理与模型认知的学科核心素养【解题思路】分子中含有羟基,可使酸性高锰酸钾溶液褪色,A错误;M分子中苯环能够发生加成反应,羟基、羧基与酯基能发生取代反应,B错误;由结构简式可知,苯环上有4种氢原子可以被取代且不等效,故苯环上有4种一溴代物,C正确;1molM中酯基水解消耗2molnaoh,羧基消耗1molnaOh,所以1molM可以消耗3molnaoh,D错误