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
参考答案:B
All men ________ by the firefighters so far.
A.are rescued
B.were rescued
C.have been rescued
D.had been rescued
差压式流量计包括节流装置、导压管、变送器三部分。