物质不需要通过化学变化就能体现的性质是（　　）

A．延展性

B．助燃性

C．稳定性

D．还原性

Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.

A.a dummy antenna

B.a supporting facilities

C.a back-up equipment

D.an antenna