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【简答题】
水溶液在生产生活中起着重要作用。 (1)下图是研究水组成的电解水实验。图中与试管A相连的是电源的________(填“正极”或“负极”),该反应的化学方程式是________________________。 (2)将浑浊的河水用下图所示的简易净水器进行净化,除过滤外,活性炭的主要作用是________,得到的________(填“混合物”或“纯净物”)。生活中降低水的硬度可采用的方法是________________。 (3)海巨大的资源宝库。利用海水提取食盐的过程如下图所示。 ①海水中的溶剂是________。从海水中提取粗盐,采用的方法是________。 ②粗盐要经过提纯处理才能得到氯化钠。去除粗盐中难溶性杂质,主要实验步骤有:________、过滤、蒸发。在过滤操作中,玻璃棒的作用是________________。 ③根据海水晒盐的原理,下列说法正确的是________(填序号)。 A.海水进入贮水池,海水的成分基本不变 B.在蒸发池,海水中氯化钠的质量逐渐增加 C.在结晶池,海水中氯化钠溶质的质量分数逐渐增加 D.析出晶体后的母液是氯化钠的饱和溶液
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参考答案:
举一反三
【判断题】世界上最大的多变贸易组织是国际货币基金组织。
A.
正确
B.
错误
【单选题】下列物质中,不能被人体消化吸收的是( )。
A.
淀粉
B.
麦芽糖
C.
乳糖
D.
果胶
【单选题】We sort the sequence(43,2,80,48,26,57,15,73,21,24,66)with shell sort for increment 3, the result is ______.(数字之间用半角的逗号分开)
A.
15, 2, 21,24,26,57,43,66,80,48,73
B.
43,2,80,48,26,57,15,73,21,24,66
C.
2,43,48,80, 26,57,15,73,21,24,66
D.
2,15,21,24,26, 43,48, 57, 66,73,80
【单选题】下列物质中,不能被人体消化吸收的是
A.
淀粉
B.
果胶
C.
糖元
D.
甘油三酯
【单选题】One of the most important features that distinguish reading from listening is the nature of the audience.【67】the writer often does not know who will read what he writes, he must【68】to be as clear as p...
A.
However
B.
Since
C.
Although
D.
Unless
【单选题】One of the most important features that distinguishes reading from listening is the nature of the audience. 【C1】______ the writer often does not know who will read what he writes, he must 【C2】______ t...
A.
However
B.
Although
C.
Since
D.
Unless
【单选题】One of the most important features that distinguishes reading from listening is the nature of the audience.【B1】the writer often does not know who will read what he writes, he must【B2】to be as clear as...
A.
However
B.
Since
C.
Although
D.
Unless
【单选题】We sort the sequence(43,2,80,48,26,57,15,73,21,24,66)with shell sort for increment 10, the result is ______.(数字之间用半角的逗号分开)
A.
15,2, 21,24,26,57,43,66,80,48,73
B.
43,2,80,48,26,57,15,73,21,24,73
C.
2,43,48,80, 26,57,15,73,21,24,73
D.
2,15,21,24,26, 43,48, 57, 66,73,87
【单选题】We sort the sequence(43,2,80,48,26,57,15,73,21,24,66)with shell sort for increment 10, the result is ______.(数字之间用半角的逗号分开)
A.
15, 2, 21,24,26,57,43,66,80,48,80
B.
43,2,80,48,26,57,15,73,21,24,73
C.
2,43,48,80, 26,57,15,73,21,24,73
D.
2,15,21,24,26, 43,48, 57, 66,73,87
【单选题】下列物质中,不能被人体消化吸收的是 ( )
A.
淀粉
B.
果胶
C.
糖原
D.
甘油三酯
E.
蛋白质
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