数控车床刀台换刀动作的圆滑性是（）需要检查保养的内容。
A.每天
B.每周
C.每个月
D.六个月
参考答案：D
Is this song popular than that one this year? [ ]
A. more much
B. more more
C. much more
D. many more
肛门视诊时应注意观察的项目不包括（）
A.肛门及周围皮肤颜色及皱褶
B.肛门周围有无脓血，黏液
C.有无肛裂
D.有无直肠息肉
E.肛门周围有无瘘管口或脓肿
