下列船壳板中较薄的是:()
A.舷顶列板
B.龙骨板
C.中部舷侧列板
D.首尾舷侧列板
参考答案:D
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In a certain animal population, for each of the first 3 months of life, the probability that an animal will die during that month is . For a group of 200 newborn members of the population, approximately how many would be expected to survive the first 3 months of life ?