根据以下材料,回答题。According to paragraph 1, what do physical proper

根据以下材料,回答题。According to paragraph 1, what do physical properties and chemical pr

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Efficient air service has been made available through modern

Efficient air service has been made available through modern technology.A.A Affl

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Why does the author mention blood types in paragraph 3?

Why does the author mention blood types in paragraph 3?

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