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【单选题】
A neutral equilibrium position for a vessel means that the metacenter is ______.A.
lower than the keel
B.
at the same height as the center of gravity
C.
exactly at midships
D.
at the center of the waterplane area
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相关题目：
【单选题】关于 I 型肺泡细胞错误的是
A.
细胞含核部分略厚，其余部分菲薄
B.
覆盖了肺泡约 95% 的表面积
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电镜下胞质中可见较多的吞饮小泡
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