_____ all the inventions have in common is ______ they have succeeded.

A．What; what 　

B．That; what

C．What; that 　

D．That; that

下列哪项是诊断胰头癌的主要体征

A．无痛性胆囊肿大

B．左上腹包块

C．黄疸

D．左锁骨上淋巴结肿大

E．上腹压痛