时时眩晕,面白少神;便溏下坠,脉细无力。治法宜选
A.补脾益气,和胃化湿B.补脾益肾,益气和营C.补养气血,健运脾胃D.益气养阴,健脾和胃
参考答案:D
下列有关准直器的论述,正确的是()
A.准直器窗口呈狭缝状态
B.准直器位于X线管窗口前端
C.准直器狭缝宽度决定扫描层厚
D.准直器狭缝宽度决定扫描层距
E.准直器狭缝宽度决定线束宽度
The exhibition is very popular, and has ____thousands of visitors from all over the world.
A encouraged B invited C disappointed D attracted