图1-2-40所示电路中,当R电阻获得最大功率时,它的大小为()Ω。
A.2.5
B.7.5
C.4
D.5
参考答案:D
I ________ that you should be invited, but to my _______, they did without you.[ ]
A. planned; great surprise
B. intended; greatly surprise
C. planned; great surprise
D. intended; great surprise
近年T-ALL采用的特异性一线单抗有()
A.CDl9
B.CD7
C.CD3
D.CD2
E.HLA-DR