产前诊断的对象不包括
A.羊水过多的孕妇
B.前置胎盘的孕妇
C.已生育过病儿的孕妇
D.有遗传病家族史的近亲婚配孕妇
正确答案是B
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分析题36图所示的组合电路,完成下列真值表,写出F的表达式,并说明该组合电路的逻辑功能。