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【简答题】
在牙膏中，常用轻质碳酸钙粉末作摩擦剂。人们通常用下列方法生产轻质碳酸钙： 将石灰石煅烧制得氧化钙，再将氧化钙加水制成石灰乳[主要成分是Ca(OH) 2 ]，然 后将净化后的石灰乳与二氧化碳作用得到碳酸钙。试用化学方程式表示上述反应的 原理。
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A.
robbed
B.
cheated
C.
picked
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stolen
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A.
(1)
B.
(2)
C.
(3)
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so as
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【单选题】Which of the following is NOT a conclusion about market allocations of commodities causing pollution externalities?
A.
、 Recycling and reuse of the polluting substances are discouraged since release into the environment is so inefficiently cheap.
B.
、 Too much pollution is produced.
C.
、 The output of the commodity is too large.
D.
、 The prices of products responsible for pollution are too high.
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