解答 解:由A中不等式变形得:(x-2)(x+1)≥0,解得:x≤-1或x≥2,即A={x|x≤-1或x≥2},∵全集U=R,∴∁RA={x|-1<x<2},∵B={x|x≥1},∴(∁RA)∩B={x|1≤x<2},故选:D. 点评 此题考查了交、并、补集的混合运算,熟练掌握各自的定义是解本题的关键.练习...
最近,北京市首个地埋式垃圾收集设备在朝阳区投用。它集除臭、灭火、称重、超重预警等多项智能技术于一身,基本杜绝了传统垃圾收集点经常出现的"脏、乱、差、臭"问题。... - 《中国环境监察》 被引量: 0发表: 2018年 中国重汽青岛重工成功研发新型吊装式垃圾车 中国重汽集团青岛重工成功研发新型环卫车——吊装式...
PROBLEM TO BE SOLVED: To naturally dry moisture adhering to the recording tape of a video cassette tape by air through small ventilation holes. ;SOLUTION: Ventilation small holes are formed in the rear 5 of the outer case 3 of the recording tape part of a video cassette tape and a book ...
[目的]本文旨在通过对菊花枯萎致病菌的分离和鉴定,研究其粗毒素对切花菊‘神马’幼苗的化感作用。[方法]观察切花菊‘神马’枯萎病的田间发病症状,采用组织分离培养法... 陈慧杰,赵爽,张凯凯,... - 《南京农业大学学报》 被引量: 0发表: 2018年 切花菊'黄中黄'对干旱胁迫的生理响应 以切花菊'黄中黄'为试...
目的:探讨腹部按摩加吴茱萸贴敷对防治老年性肛肠病术后腹胀的疗效.方法:依据手术先后时间将112例肛肠病术后老年患者按奇偶数分为治疗组和对照组,每组各56例.对照组采用术后常规热敷护理;治疗组采用腹部按摩加吴茱萸药饼贴敷治疗.对比观察两组的疗效.结果:治疗组总有效率为94.64%,对照组总有效率为76.79%,治疗组疗效...
(57) [summary] By attaching the intake Remove function of tie tack to [purpose] button, easily installed, provides a convenient button that can remove and. [Configuration] on the rear surface of the button, characterized in that it has attached a convenient utensil to remove collected.收藏...