人类免疫缺陷病毒(HIV)的受体是()
A.CD2
B.CD3
C.CD4
D.CD8
E.CD28
参考答案:C
切削用量各要素对切削温度有什么影响?
A certificated lifeboatman assigned to command the lifeboat should().
A.be the first individual to board the craft
B.drain the hydraulic pressure before lowering the craft
C.have a list of the persons assigned to the lifeboat
D.All of the above