阵发性睡眠性血红蛋白尿的实验室检查最主要诊断依据是()

A.红细胞渗透脆性试验增高 

B.血红蛋白电泳异常 

C.外周血中CD55阴性细胞数量增多 

D.抗人球蛋白(Coombs)试验阳性 

E.高铁血红蛋白还原试验异常

Roger Hickstead owns 100 shares of Cole Corporation stock with a current market value of $45 per share. Consensus stock price estimates from the leading industry analysts predict the price of Cole will fall to $35 per share in the next five months. What type of derivative strategy should Hiekstead employ if he is not willing to lose more than $10()

A. Buy a put with a strike price of $37 and a premium of $2. 

B. Buy a covered call with a strike price of $37 and a premium of $2.

C. Buy an uncovered call with a strike price of $37 and a premium of $2.