主要用于装卸、搬运和堆码成件包装货物的装卸机械是（）。

A、起重机

B、叉车

C、输送机

D、翻车机

A branch line valve of a fire extinguishing system on a ship must be marked with the（）.

A.maximum pressure allowed at that branch

B.name of the space or spaces which it serves

C.date of the last maintenance inspection

D.pressure needed to maintain an effective stream at that point