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【简答题】
海水是巨大的资源宝库，从海水中提取食盐和溴过程如下： （1）将NaCl溶液进行电解，在电解槽中可直接得到的新产品有H 2 、_______、______或H 2 、______． （2）步骤Ⅱ中用SO 2 水溶液吸收Br 2 ，吸收率可达95%，有关反应的离子方程式为______． （3）某化学研究性学习小组为了解从工业溴中提纯溴的方法，查阅了有关资料：Br 2 的沸点为59℃，于水，有毒性和强腐蚀性．他们参观生产过程后，绘制了如下装置简图： 请你参与分析讨论： ①实验装置气密性良好，要达到提纯溴的目的，操作中如何控制关键条件______． ②C中液体产物颜色为______，为除去该产物中仍残留的少量Cl 2 ，可向其中加入NaBr溶液，充分反应后，再进行的分离操作是______． ③用离子方程式解释NaOH浓溶液的作用______．
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【判断题】原材料库和半成品库,因为有载重汽车直接出入的频率比较高,采用低地面式较有利。流通库,因在库内分货、配货,并根据商品的不同,采取不同的存放方式,采取高地面式较为合适。
A.
正确
B.
错误
【简答题】American black bears appear in a variety of colors despite(尽管) their name. In the eastern part, most of these bears have shiny black fur, but in the west they grow brown, red, or even yellow coats. To...
【单选题】听力原文： American black bears appear in a variety of colors despite their name. In the eastern part of their range, most of these brown, red, or even yellow coats. (32) To the north, the black bear is ac...
A.
Gray or white.
B.
Brown or red.
C.
Red or yellow.
D.
Yellow or red.
【单选题】Despite its gargantuan heft, John Irving's 11th novel moves nimbly from a standing start to warp speed. Legions of the author's admirers will still be searching for a comfortable way to accommodate th...
A.
Hardship of poor people
B.
disorder between various people
C.
children's experiences under the strange and uncomfortable circumstances
D.
rebellion of youth against their parents
【单选题】Despite much research, there are still certain elements in the life cycle of the insect that _____not fully understood.
A.
are
B.
were
C.
is
D.
was
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