单项选择题

直接眼底镜采用后映照法观察屈光介质时，见到瞳孔区呈暗红色，提示()。

A.玻璃体出血
B.晶状体混浊
C.视网膜脱离
D.眼内肿瘤
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A verification plan shows a network diagram with branch office Routers B1 through B100, plus two ABRs, ABR1, and ABR2, all in area 100. The branches connect to the ABRs using Frame Relay point - to - point subinterfaces. The verification plan lists the output of the show i p ospf database summary 10.100.0.0 command on a router B1, one of the branches.Which of the following is true regarding the output that could be listed for this command?（）A.The output lists nothing unless 10.100.0.0 has been configured as a summary rou te using the area range commanD.B.If 10.100.0.0 is a subnet in area 0, the output lists one Type 3 LSA, specifically the LSA with the lower metric when comparing ABR1‘s and ABR2‘s LSA for 10.100.0.0.C.If 10.100.0.0 is a subnet in area 0, the output lists two Type 3 LSAs, one each created by BR1 and ABR2.D.None, because the Type 3 LSAs would exist only in the ABR‘s LSDBs.
A.100.0.0
B.Which
C.100.0.0
D.
E.100.0.0
F.100.0.0.
G.100.0.0
H.
单项选择题
婴儿萌出乳牙的时问一般是( )左右。A. 4个月B. 6个月C. 12个月D. 14个月
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