缺铁性贫血的铁代谢检查结果是()。
A.血清铁降低
B.细胞内铁明显减少或缺如
C.运铁蛋白饱和度减低
D.血清总铁结合力增高
E.细胞外铁阳性
参考答案:A, B, C, D
The companies are working together to create _____they hope will be the best means of transport in the 21st century.[ ]
A. which
B. that
C. what
D. who
推煤机冷却系统的冷却介质有液体、空气和固体三种。()