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【单选题】
胎儿期左右心房间血流方向从
A.
左心房经第二房间右心房
B.
右心房经卵圆孔，第一房间左心房
C.
左心房经卵圆孔至右心房
D.
左心房经第一房间右心房
E.
右心房经卵圆孔和第二房间左心房
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The parking lot will be right next to the water.
B.
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The parking lot will be moved to a place far from the beach.
查看完整题目与答案