正常髓鞘的脱髓鞘疾病下列哪些正确()
A.多发性硬化症
B.弥漫性硬化
C.急性出血性白质脑病
D.肾上腺脑白质营养不良
E.急性播散性脑脊髓炎
参考答案:A, B, C, E
It ______ the workers about 20 months to build the Huhang highspeed railway.
A.took
B.spent
C.cost
D.paid
谱系分类法