国内肝细胞癌的分型包括（）

A.单结节型、多结节型、弥漫型

B.中心型、周围型、肝门型

C.巨块型、结节型、弥漫型

D.内生型、外生型、浸润型

E.小肝癌型、巨块型、弥漫型

A carbon dioxide fire extinguisher should be recharged（）.

A.at least annually

B.whenever it is below its required weight

C.only if the extinguisher has been used

D.before every safety inspection