脊髓亚急性联合变性的病因是()
A.维生素B1缺乏
B.维生素B6缺乏
C.维生素B12缺乏
D.内因子缺乏
E.叶酸缺乏
参考答案:C
—Hi, Lucy. Please ____the book ____Kate.[ ]
A. give to
B. give in
C. give from
LTE最多可同时支持多少个用户得到调度:()
A.40
B.88
C.22
D.80