前置机系统担负着与厂站综合自动化设备、RTU和各分局的（）等任务。A.保存所有~历史

人体缺乏维生素B₁时，容易患    [ ]

A．脚癣病

B．脚气病

C．佝偻病

D．皮肤粗糙

丹砂丸1功效与作用

The early railroads were connected short lines in the existing arteries of transportation: roads, turnpikes, canals, and other waterways.

A．short lines that connected

B．those short fines connected

C．connected by short lines

D．short connected lines

患儿，见形体明显消瘦，面色萎黄，肚腹膨胀，甚则青筋暴露，毛发稀疏结穗，精神烦躁，夜卧不宁，或见揉眉挖鼻，吮指磨牙，动作异常，食欲不振或善食易饥，或嗜食异物，舌淡苔腻，脉沉细而滑。治疗首选方剂是

A．消乳丸加减
B．保和丸加减
C．健脾丸加减
D．理中丸加减
E．肥儿丸加减

在关系数据模型中，二维表的行称为元组，二维表的列称为【 】。