-2-1= 【 】 A、-1 B、1 C、3 D、-3
在下列①~⑩中选出适宜的词语填入下列每小题的空格中(填编号): ①渗析 ②盐析 ③聚沉 ④溶胶 ⑤凝胶 ⑥布朗运动 ⑦电泳 ⑧丁
It took her a while to adjust to __________alone after the divorce(离婚). A. live B. living C. have lived D. being lived
二硫化碳(液态)能够在氧气中完全燃烧生成CO2和SO2。若将0.228 g CS2在448 mL O2(标准状况,过量)中充分燃烧,则燃烧后所得混合气体在标准状况下的体
30.The problem lies in ______ the mist may become a thick fog , making the situation even worse. A. that B. which C. wh
下列各句中加点的成语使用不恰当的一项是( ) A.我们学过的《爱莲说》、《陋室铭》,都是历来脍炙人口的名篇。 B.年轻的城市,
在边长为的矩形板的四个角上截去四个相同的小正方形,作成一个无盖的盒子,求盒子容积的最大值。
Our school have planted different kinds of trees and flowers, _____ a beautiful and peaceful environment for students.. A. create B. creating C. to crea