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【判断题】
C语言是一种语算机低组语言。
A.
正确
B.
错误
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举一反三
【简答题】完形填空。 When I was about 12, a girl in my class liked to point out my problems. I was too thin; I wasn't a good student; I talked too much, I was too 1 , and so on. At last, I became very angry and ran ...
【简答题】I can well remember that I was once asked to deliver a speech titled—A Real Test in My Life before the whole class at the age of 9! You can imagine how 1. (terrible)­shy I was the moment I thought of ...
【简答题】(Para.3) And so it is with all major news stories. I remember when I was at primary school the teacher announcing pale-faced to a startled class of seven-year-olds President Kennedy is dead. I didn't ...
【单选题】下列关于分散系概念的描述,正确的是()
A.
分散系只能是液态体系
B.
分散系中被分散的物质称为分散相
C.
分散系为均一、稳定的体系
D.
分散系相微粒都是单个分子或离子
E.
:B
F.
下列哪种体系的分散相粒子能透过滤纸而不能透过半透膜( )
G.
粗分散系
H.
分子离子分散系
I.
胶体分散系
J.
都不是 K. :C L. 下列几种分散系中能发生丁达尔现象的是( )
【单选题】下列物质中能透过滤纸不能透过半透膜的是
A.
生理盐水
B.
蛋白质
C.
泥浆
D.
牛奶
【单选题】下列关于蛋白质的叙述中,不正确的是 [     ] ①蛋白质溶液中加入饱和硫酸铵溶液后,蛋白质析出。虽再加水,也不溶解 ②人工合成的具有生命活力的蛋白质--结晶牛胰岛素是我国科学家在1965年首次合成的 ③重金属盐能使蛋白质凝结,所以误食可溶性重金属盐会中毒 ④浓硝酸溅在皮肤上,使皮肤呈黄色是由于浓硝酸和蛋白质发生了颜色反应 ⑤蛋白质分子能透过滤纸,但不能透过半透膜 ⑥天然蛋白质的最终水解产物是α...
A.
B.
②③④⑤
C.
⑥⑦
D.
全部
【单选题】I was _____ in class at 3:00 p.m. yesterday. A. to study B. study C. studying
A.
to study
B.
study
C.
studying
【简答题】纳米科技是21世纪经济发展的发动机。人们会利用纳米级(1~100 nm,1 nm=10-9 m)微粒物质制造出更加优秀的材料和器件,使化学在材料、能源、环境和生命科学等领域发挥越来越重要的作用。 (1)下列分散系的分散质与纳米级微粒在直径上具有相同数量级的是 [     ] A.溶液 B.胶体 C.悬浊液 D.乳浊液 (2)将纳米级微粒物质溶解于液体溶剂中形成一种分散系,对该分散系及分散质颗粒的叙...
【简答题】I first had physics lessons when I was in Grade Eight some years ago. In class, I 1 that there wasn’t a Nobel (诺贝尔) Prize winner from China. That made me sad, and I decided to change (改变) it. 2 after ...
【简答题】I used to be a very self ­ centered person , but in the past two years I have really changed.I have started to think about other people 1 I think about myself.I am happy that I am becoming a 2 person....
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