与维生素B12缺乏无关的疾病是( )
A.家族性维生素B12吸收不良症
B.遗传性转钴铵Ⅱ缺乏症
C.甲基丙二酸尿症
D.先天性叶酸代谢障碍
E.恶性贫血
参考答案:D
She _______________ her homework last night. [ ]
A. didn't
B. doesn't
C. didn't do
D. doesn't do
蒸汽锅炉运行时,()冲洗水位计一次。
A、每天
B、每班
C、每周
D、每三天