孕20周胎儿身长、体重为A.50cm,3400g B.25cm,320g C.45cm,2500g D.35cm,1000g E.16cm,110g

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问题 孕20周胎儿身长、体重为

选项 A.50cm,3400g
B.25cm,320g
C.45cm,2500g
D.35cm,1000g
E.16cm,110g

答案B

解析
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