【简答题】“20℃时,食盐的溶解度为36克”,这句话的涵义是( ) A.20℃时,100克食盐饱和溶液中含有食盐36克 B.20℃时,100克水中最多能溶解36克食盐 C.36克食盐溶解在100克水中正好达到饱和 D.20℃时,36克水最多能溶解100克食盐
【简答题】氯碱工业中电解饱和食盐水的原理示意图如下图所示: (1)溶液A的溶质是 ; (2)电解饱和食盐水的离子方程式是 ; (3)电解时用盐酸控制阳极区溶液的pH在2~3,用化学平衡移动原理解释盐酸的作用 ; (4)电解所用的盐水需精制。去除有影响的Ca 2 + 、Mg 2 + 、NH 4 + 、SO 4 2 - [c(SO 4 2 - >c(Ca 2 + )]。精致流程如下(淡盐水和溶液A来自电解池):...
【单选题】被称为软装设计“商人”的是哪个的软装设计师?
【单选题】Which is the following statement is true according to the text?
A.
Burberry is a local English brand and can be seen only in England.
B.
Char usually wear a special kind of uniform. with a plaid cap.
C.
Chars are people of fancy taste.
D.
What the socalled chavs wear now are not real products of Burberry.
【单选题】Last Sunday, I went to ___ with my daughter.
【简答题】氯碱工业中电解饱和食盐水的原理示意图如图所示。 ⑴溶液A的溶质是___________。 ⑵电解饱和食盐水的离子方程式是___________。 ⑶电解时用盐酸控制阳极区溶液的pH在2~3。用化学平衡移动原理解释盐酸的作用:___________。 ⑷电解所用的盐水需精制,去除有影响的Ca 2+ 、Mg 2+ 、NH 4 + 、SO 4 2- [c(SO 4 2- )>c(Ca 2+ )]。精制流...
【单选题】有关腺垂体功能减退症的药物治疗,错误的是
C.
治疗过程中先补充甲状腺激素,然后补给糖皮质激素
【单选题】Choose the best answer to each of the following unfinished statements according to the information you get from the text. 1.________ is the Arctic Ocean's defining feature.
A.
The tragedy playing out in the North