读等高线地形图，正确的说法是

A、从甲处攀登山峰最近、最省力

B、从乙处攀登山峰较远、最省力

C、从丙处攀登山峰较远、最费力

D、从丁处攀登山峰最远、最省力

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