不作玻璃体切割的病例是,玻璃体原有浓缩、条索、粘连、视网膜改变,若需注气最好不用
A.空气
B.六氟化硫(SF6)
C.C2F6
D.C3F8
参考答案:D
My grandfather is fon’d of talking about good old days, _____is often the case with old people.
A.when
B.as
C.that
D.what
有关肾盂恶性肿瘤的描述中,下面不正确的是()
A.浸润性尿路上皮癌最为多见
B.多表现为无痛性肉眼血尿
C.肉眼表现为 * * 状、息肉状或结节状
D.低级别者表示癌细胞异型性大
E.可伴有鳞状分化