皮皮学，免费搜题
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【多选题】
体内含量最多的无机盐是A.
钠
B.
氯
C.
镁
D.
钙
E.
磷
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皮皮学刷刷变学霸
举一反三
【简答题】Coal can easily be to gas.
【单选题】Fire needs three things to burn: oxygen, fuel, and heat. Fuels can be wood, tinder, coal, or any other substance that will easily oxidize. Therefore, a fire can be stopped in three different ways, by ...
A.
Compare and Contrast
B.
Spatial
C.
Chronological
D.
Problem and Solution
E.
Cause and Effect
F.
Order of Importance / Sequence
【单选题】Coal can easily be ________ to gas.
A.
substituted
B.
associated
C.
reduced
D.
converted
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