有一幅地图,图上一厘米代表实地距离15千米,其数字比例尺是[ ]
A.1:15
B.1:1500
C.1/1500000
D.1/15000
答案:C
Mary isn't here at the moment. She _______ later. [ ]
A. comes
B. came
C. has come
D. is coming
有一名颅底骨折病人,以下哪项是正确的()
A.血性脑脊液病人,腰穿放脑脊液
B.脑脊液耳漏,需尽早修补硬膜漏口
C.伤后视力减退,超过一个月可手术减压
D.颅底骨折,需手术治疗,以便神经减压
E.着重观察有无脑损伤,并处理脑脊液漏、神经损伤等