【单选题】【消耗次数：1】
产前超声检查NT的孕周是多少?
①
11-13+6周
②
11-14周
③
10-13周
④
11-13周
⑤
12-16周
参考答案：
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初产妇，32岁，中孕期唐氏筛查低风险，21周超声提示胎儿相当于19周，25周复查超声显示胎儿相当于21周，羊水池深度6cm。下列检查不恰当的是：
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