产妇，23岁，会阴侧切分娩一足月儿，体重3500g，现为产后25小时，会阴水肿明显，

营养性巨幼细胞贫血是因为缺乏（）

A.叶酸和铁

B.叶酸和维生素B12

C.维生素D和维生素B12

D.叶酸和维生素C

E.维生素A和维生素C

在我国，现金日记账和银行存款日记账要选用()。

A．活页式账簿

B．订本式账簿

C．卡片式账簿

D．自己认为合适的账簿

进站信号机的设置地点是如何规定的？

存在于TCR或BCR可变区的抗原决定簇（）。

A.自身抗原

B.同种异型抗原

C.超抗原

D.独特型抗原

E.异嗜性抗原

“It is declared that this shipment does not contain any wood packing materials．”与这句话意思接近的是( )。

A．We declare that no wood packing material was used in this shipment

B．No declaration was made whether wood packing materials had been used or not

C．If you don' t make any declaration，we will not use any wood packing material

D．We will not use any wood packing material since you have provided us a declaration of no-wood packing material