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【单选题】
在( )情况下最有利于静脉血流回心。A.
平静吸气
B.
平静呼气
C.
憋气
D.
肌肉持续收缩
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A.
To create a wonder in the world.
B.
To punish the people who disobeyed him.
C.
To protect his empire from attack.
D.
To show off the strength of his empire.
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