（）则是通过检索工具的指导再查找原始文献而获取所需信息。A.间接检索 B.直接检索

男性，50岁，持续性腹泻1年，每日4~5次黄色稀水便或糊状便，食欲明显下降，1个月来出现腹胀及下肢水肿。查体：全身消瘦，皮肤干燥，腹部轻度膨隆，移动性浊音阳性，肝脾未及，双下肢压陷性水肿。最可能的诊断是（）

A.慢性肾炎

B.营养不良性水肿

C.慢性肾盂肾炎

D.黏液性水肿

E.老年性水肿

腹部MRA技术不包括（）

A.不需禁食

B.线圈体线圈、体部相控阵体部线圈

C.扫描技术采用3D-CE-MRA技术的超快速三维梯度回波序 * * D-FISP

D.采集成像一般取6次

E.根据病情可分别得到动脉期和门静脉期

Low-carbon lifestyle is of great benefit to improve the world environment. _____ can be enjoyed from it until

you have a deep understanding of it, however. [ ]

A. Something

B. Nothing

C. Few

D. Much

Thank you for all your hard work last week. I don't think we _____ it without you. [ ]

A. can manage

B. could have managed

C. could manage

D. can have managed

其他条件不变，原油性质变轻，初馏塔顶油水分离罐（）。

A.油位升高

B.油位降低

C.油位不变

D.油水界位降低