a book and two pens on the desk.[ ]
A.There's
B.There are
C.This is
D.These
答案:A
肝包虫病与肝脓肿相鉴别的征象是()
A.病灶周围肝实质充血水肿
B.病灶周围肝实质无充血水肿
C.病灶呈多囊
D.病灶中心有坏死
E.病灶内有间隔
组分色谱柱恒温箱温度为()±0.5OC。
A.50
B.100
C.70
D.30