题目内容

A.foundB.changedC.reachedD.influenced

A. found
B. changed
C. reached
D. influenced

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Gases are main part in the corona rays.

A. Right
B. Wrong
C. Not mentioned

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The corona looks like a moon.

A. Right
B. Wrong
C. Not mentioned

低O2对呼吸中枢的主要作用是

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