It is surprising for them to complete _____ work in _____. [ ]

A. so little…such a short time

B. so much… so short time

C. such little…so short a time

D. so much…such a short time

下列有关尿标本留取时的叙述正确的是

A．留取12h尿标本时，应在最后一次倒入尿后加入防腐剂

B．留尿标本时如混入粪便，应及时滤去粪便

C．尿常规标本应在晨起时留取

D．尿培养标本的采集方法包括导尿术和留取中段尿

E．留取12h尿标本时，应事先在清洁容器内加入防腐剂