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Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do. He finally concluded t
Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do. He finally concluded t
admin
2010-01-13
60
问题
Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do. He finally concluded that the constituent 【C1】______ must exist in the form of tiny particles or atoms and that these 【C2】______ be completely mixed together in the atmosphere. This threw a new light in 【C3】______ law of definite proportions. It was only necessary to suppose that the atoms 【C4】______ combine into small groups of uniform 【C5】______ and so form more complex substance; 【C6】______ the mystery of this law was 【C7】______ . Dalton suggested, for example, that carbon monoxide 【C8】______ formed by the one with one 【C9】______ of atoms of carbon and oxygen, 【C10】______ carbon dioxide results from a single 【C11】______ of carbon uniting with two atoms of oxygen. Assuming this to be true, 【C12】______ the definite proportions of Prout’s law 【C13】______ all chemical compounds the different constituents 【C14】______ enter in unvarying proportions would naturally 【C15】______ the relative weights of the many different kinds of atoms.
【C10】______
选项
A、while
B、when
C、therefore
D、also
答案
A
解析
while表示对比。如:Some substances are soluble,while others are not.一些物质是可溶的,而另一些物质是不可溶的。
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