The man _____France. [ ]
A. is come from
B. is from
C. come from
D. are come from
答案:B
简述视觉导示系统的影响.
Dandy-Walker的主要病理改变包括()
A.P-E缝
B.第四脑室囊状扩大和脑积水
C.小脑蚓部缺如或发育不良
D.室管膜下胶质结节
E.天幕及窦汇抬高