关于女性骨盆，哪项错误
A．骶坐切迹呈圆形
B．入口横径较前后径稍长
C．骨盆入口为圆形
D．耻骨弓较宽
E．坐骨棘间径≥10cm
参考答案：C
_______ in the war, many children have become orphans(孤儿).
A．Their parents were killed
B．Being killed
C．Their parents killed
D．Killed
设有关系模式R(A，B，C)，根据语义有如下函数依赖集：F＝A→B，(B，C)→A)。关系模式R的规范化程度最高达到( )。
A．1NF B．2NF C．3NF D．BCNF
