My friend Martin was very sick with a strange fever;   ___  , he could neither eat nor sleep.     [    ]

A. as a result    

B. after all    

C. anyway  

D. otherwise

下述哪项不是抽空器本身常见故障（）。

A.抽空器喷嘴堵塞

B.喷嘴口径不符合设计要求

C.喷嘴安装未对准中心

D.抽空器位置装错