下列哪项不是血红蛋白肽链结构()
A.HbA-αβ
B.HbA-α2β2
C.HbA2-α2δ2
D.HbF-α2γ2
E.HbBarts-γ4
参考答案:A
—Is there anything you want me to get on the bus?
—Sure. _____ take the suitcase? [ ]
A. Do you mind
B. How about
C. Had you better to
D. Why don't you
洄流焊焊接工艺中因元器件两端受热不均匀而容易造成的焊接缺陷主要是()
A、空焊
B、立碑
C、偏移
D、翘脚