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【简答题】
以食盐为原料进行生产并综合利用的某些过程如下图所示。 （1）除去粗盐中的Ca 2+ 、Mg 2+ 和SO 离子，加入下列沉淀剂的顺序是（填序号） 。 a．Na 2 CO 3 b．NaOH           c．BaCl 2 （2）将滤液的pH调至酸性除去的离子是 。 （3）若向分离出NaHCO 3 晶体后的母液中加入过量生石灰，则可获得一种可以循环使用的物质，其化学式是 。 （4）纯碱在生产生活中有广泛的应用。 ① 纯碱可用于除灶台油污。其原因是 。 ②工业上，可以用纯碱代替烧碱生产某些化工产品。如用饱和纯碱溶液与Cl 2 反应制取有效成分为NaClO(次氯酸钠)的消毒液，其反应的化学方程式是 。（已知碳酸的酸性强于次氯酸HClO）。
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B.
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C.
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D.
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【单选题】中国人常说“胆小如鼠”，而俄罗斯人则说“胆小如（ ）”。
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兔
B.
鸡
C.
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D.
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【简答题】Amy: So,Nick's story is true? Can you(1) ______ before it's too late? Talia: I hope so.I should have believed him from the start. He was always the(2) ______ person in college. Amy: And he's a great s...
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【单选题】中国人常说“胆小如鼠”，而俄罗斯人则说“胆小如（ ）”。
A.
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B.
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C.
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【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
He will arrive at 9:15.
B.
He is habitually late.
C.
He is an hour and a haft late.
D.
He is supposed to arrive at 10:45.
查看完整题目与答案
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B.
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D.
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【简答题】I said it's too late to ____8____
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【简答题】十九大报告强调,____是发展的根本目的。
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