涉及医患争议的尸检，关于大体标本的保存期限正确的是（）

A.自签发病理学诊断报告书之日起保存3个月

B.自签发病理学诊断报告书之日起保存6个月

C.自签发病理学诊断报告书之日起保存12个月

D.自签发病理学诊断报告书之日起保存24个月

E.按照尸检前有关各方签署的协议办理

At the required fire drill conducted aboard a vessel，all persons must report to their stations and demonstrate their ability to perform the duties assigned to them（）.

A.by the toolpusher

B.in the station bill

C.by the person conducting the drill

D.at the previous safety meeting