羊水卵磷脂/鞘磷脂比值为多少时，提示胎儿肺不成熟（） A. B. C. D. E.
题型：单项选择题 A1/A2型题
问题：
羊水卵磷脂/鞘磷脂比值为多少时，提示胎儿肺不成熟（）
A.<1
B.<2
C.<3
D.<5
E.<6
题型：单项选择题 A1/A2型题
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| 1. Where is the library? It is the bus stop. 2. Where is the house? It is the library. 3. Where is the restaurant? It is the house. 4. is the bus stop? It is the restaurant. 5. Jenny lives in a .
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