【简答题】• Let's listen to the dialogue. Ø A: I met Tom Cruise in a pub last night. He bought me a drink. Ø B: ________ __1____________? • I've noticed that the other British people I work with are always ____...
【单选题】关于二极管,三极管下列说法错误的是
B.
二极管正向施加适当的电压能导通,反向施加电压会截止
D.
三极管的三极分别是B(基)极,E(发射)极和E(集电)极
【单选题】PM2.5是指大气中直径小于或等于2.5微米的颗粒物,也叫可入肺颗粒物,与肺癌、 哮喘等疾病的发生密切相关,是灰霾天气的主要原因,它主要来自化石燃料的燃烧(如机动车尾气、燃煤)等。2012年2月,国务院同意发布新修订的《环境空气质量标准》,增加了PM2.5监测指标。下列与PM2.5相关的说法不正确的是
C.
其颗粒小,在大气中的停留时间长、输送距离远,因而对人体健康影响更大
【简答题】某研究小组欲用平板收集教室空气中的微生物,以了解教室内不同高度空气中微生物的分布情况。实验步骤如下:39.[生物——选修1:生物技术实践](15分) 空气中的微生物在重力等作用下,可以一定程度地沉降。某研究小组欲用平板收集教室空气中的微生物,以了解教室内不同高度空气中微生物的分布情况。实验步骤如下: ①配置培养基(成分:牛肉膏、蛋白胨、NaCl、X、H2O); ②制作无菌平板; ③设置空白对照组和...
【简答题】小题1:He noticed someone following him, and glanced round. He _______ _______ _______ a dark figure in the shadows. 小题2:The best love for someone is heartful care _______ _______ money 小题3:I was _______...
【简答题】“Don’t tread on me” could have been coined only by someone with a spread. (Paragraph 5) 2. The decline of manners has been widely lamented. (Paragraph 6) 3. I’ve also noticed an increase in the ranks ...
【简答题】I’ve often had difficulty remembering names. Proper nouns seldom found easy purchase in my brain unless I consciously repeat them over and over again. Needless to say, when people leave my life their ...
【多选题】结构设计中,常用的连接方式主要有( )、( )、( )三种。
【单选题】在结构设计中,常用的连接方式主要有( )、黏结方式、焊接方式三种。