_________with the size of the whole earth, the biggest ocean does not seem  big at all. [ ]

A. Compare      

B.When comparing  

C. Comparing    

D.When compared

诊断温抗体型自身免疫性溶血性贫血的最主要的实验室检查是

A．Ham试验

B．蛇毒因子溶血试验

C．Coombs试验

D．Danath-Landsteiner试验

E．血红蛋白电泳