调查时由于调查对象的代表性很差，使结果出现误差的偏倚是 A．选择性偏倚 B．无应答偏

斗轮机有哪几种堆料方式？

_____ that Mike was sure to be admitted into the art school. [ ]

A. So successful was his performance  

B. So successful his performance

C. So his performance was successful  

D. So was his successful performance

鼻前庭疖肿错误的处理方法是

A．疖肿未成熟时可挤压

B．疖肿破溃后可不理睬

C．已成熟的疖肿，可切开并延长到周围浸润部分

D．已成熟的疖肿，用硝酸银腐蚀脓头

E．外覆鱼石脂软膏

国家要求开展的单病种的六个病种是什么？

信用卡遗失怎么办？