多能造血干细胞的具有鉴别意义的标志为
A.CD3
B.CD28
C.CD16
D.CD34
E.CD2
参考答案:D
— ________________ today?
— It's nice and warm.[ ]
A. What's the weather
B. What's the weather like
C. How is the weather like
在Windows中,若将整个屏幕存入剪贴板中,可以按( )。
A.Atl+Print Screen键
B.Ctrl+Print Screen键
C.Print Screen键
D.Shift+Print Screen键