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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
2011-01-21
32
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【C2】______particles of atoms and that these【C3】______be completely mixed together in the【C4】______.
This threw a new light on【C5】______laws of definite proportions. It was【C6】______necessary to suppose that the atoms【C7】______combine into small groups of uniform【C8】______and so form more complex substances;【C9】______the mystery of this law was【C10】______. Dalton suggested, for example, that carbon monoxide【C11】______formed by the one with one【C12】______of atoms of carbon and oxygen,【C13】______carbon dioxide results from a single【C14】______of carbon uniting with two toms【C15】______oxygen. Assuming this to be true,【C16】______the definite proportions of Proust’s law【C17】______all chemical compounds the different constituents【C18】______enter in unvarying proportions would naturally【C19】______the relative weights of the many【C20】______kinds of atoms.
【C12】
选项
A、putting
B、pairing
C、placing
D、preparing
答案
B
解析
one pairing of一对,一双。
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