* * 流出黄水样或淡红色血性分泌物最常见于( )
A．慢性宫颈炎 B．滴虫性 * * 炎C．老年性 * * 炎 D．霉菌性 * * 炎
参考答案：C
He is the only one of the students __________ want to accept the teacher's advice.[ ]
A. that don't
B. who don't
C who doesn't
D. that do
铲齿成形铣刀的齿背曲线是（）。
A.圆弧
B.阿基米德螺线
C.对数螺线
D.双曲线
