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

划分唯物主义与唯心主义的唯一标准是（）。

A．世界是否可知的问题

B．世界是否运动变化的问题

C．物质和意识何者为第一性的问题

D．认识与实践的关系