固体微粒由于重力作用在液体物料中自然下沉,用虹吸管吸取上清液从而达到固液分离的方法( 发布时间:2018-02-24 16:51 │ 来源:www.tikuol.com 题型:单项选择题 B1型题 问题: 固体微粒由于重力作用在液体物料中自然下沉,用虹吸管吸取上清液从而达到固液分离的方法()A.沉降分离 B.滤过分离 C.旋转分离 D.吸附分离 E.滤过分离
题型:单项选择题 B1型题 用方框中所给词或词组的正确形式填空,每个词或词组只用一次be different from; help... with; take the subway; think of; get to; look after; move; have a picnic; stand for; grow up 1. My mother was out, so I had to my little sister at home. 2. What about in the park on Sunday? 3. Miss Gao often to work. 4. The weather in China that in America. 5. The twins were born in New York, but they in London. 6. He school at 7:30 every day. 7. —What do you the Chinese people? —They are very friendly. 8. Jim, let's the stone, it's dangerous on the road. 9. UN the United Nations. 10. She often ______ me ______ my English. 查看答案
题型:单项选择题 B1型题 It takes time for the campus culture to develop and ________, but it doesn't necessarily justify the lackof culture on new university campus. [ ]A. appeal to B. settle inC. lay off D. set down 查看答案
题型:单项选择题 B1型题 反应:3A(g)+B(g)=2C(g)+2D(g),在不同条件下,用不同物质表示其反应速率,分别为:①v(A)="0.6" mol·L-1·min-1;②v(B)="0.45" mol·L-1·min-1;③v(C)="0.015" mol·L-1·min-1;④v(D)="0.45" mol·L-1·min-1。则此反应在不同条件下进行得最快的是( )。A.③ B.① C.④ D.② 查看答案
题型:单项选择题 B1型题 在FoxBase中要建立一个与现有的某个数据库有完全相同结构和数据的新数据库,应该使用如下语句中的哪个语句A.CREATEB.APPENDC.COPYD.INSERT 查看答案