促进红细胞生成的是()
A.IL-1
B.IL-2
C.IL-3
D.EPO
E.IFN-α
参考答案:D
He often _____ some good presents on his birthday. [ ]
A. makes
B. gets
C. sends
D. buy
与硝镁蒸发器直接相连的设备有()。
A.稀镁泵
B.浓镁罐
C.间接冷却器
D.冷凝水膨胀槽