设U={x∈Z|0<x≤10},A={1,2,4,5,9},B={4,6,7,8,10},C={3,5,7}, 求A∩B, (CUA)
设U={x∈Z|0<x≤10},A={1,2,4,5,9},B={4,6,7,8,10},C={3,5,7}, 求A∩B, (CUA)∩(CUB), (A∩B)∩C,
现有分子式为C9H9O2X的物质甲(X为卤族元素),在一定条件下有如下的转化关系,其中E可作为工业上的增塑剂。(1)写出下列物质的结构简式:甲_______
. —Excuse me, I want to have my watch fixed, but I can’t find a repair shop. —I know _____ nearby. Come on, I’ll show you. A. one B. it C. some
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“绿叶在光下制造有机物”的实验步骤顺序依次是( ) ①暗处理 ②叶片脱色 ③光照 ④选叶遮光 ⑤滴加碘液 ⑥清水冲洗
When I left home for college, I sought to escape the limited world of farmers, small towns, and country life. I long for the excitement of the city, for the fast pace that rural life lacked, for ad
如图,已知△ADE与△ABC的相似比为1:2,则△ADE与△ABC的面积比为( ). A. 1:2 B. 1:4 C. 2:1 D. 4:
完成句子 1. 你不应该在班上吃炸薯条。 You shouldn’t eat _______ _______ in class. 2. 如果我不完成作业,我的老师会生我的气。 If I _______ _______ my homework,