患儿2岁,CT检查右眼球后方不规则肿块,并有斑块状钙化,最可能的诊断为()
A.泪腺混合瘤
B.视网膜母细胞瘤
C.视神经胶质瘤
D.格氏眼病
E.渗出性视网膜炎
参考答案:B
—I am so sorry to have come late for the meeting.
—It is not your fault.With ________ rush-hour traffic and ________ heavy rain,it is no wonder you were late.
A.a;a
B.the;the
C./;/
D./;a
对任意m∈R,曲线x2-y2+mx-my-m-3=0都经过定点( )
A.(2,1)
B.(1,2)
C.(3,2)
D.(-2,-3)