在螺纹磨床上磨削蜗杆时，砂轮锥面会在齿面发生干涉，使蜗杆齿形被磨成凹形。（质量珍断）
参考答案：错
脓液黄白稠厚者为（）
A．初起有多个粟粒状脓头
B．初起疮形如粟，突起根浅
C．初起疮形如粟粒状脓头，坚硬根深
D．初起光软无头，红肿疼痛，范围约6～9cm
E．初起皮肤片状红斑，边界清楚，压之褪色，抬手即复
Excuse me, can you tell me the way to the bus stop?（）
A.Yes, go straight down this way to the end.
B.Why do you ask me the way?
C.Yes, I will.
D.No, I can't tell you that.
