Dry cargoes are those commodities that（）.

A.never leak but may be spoiled by leakage

B.sometimes leak and damage themselves

C.often leak and damage other cargo

D.neither leak nor will be damaged by leakage

APU燃油加热器使用何处来的空气对供应到APU的燃油进行加热（）.

A.APU进气口来自空气

B.APU排气口上方小孔处来的影射空气

C.对APU滑油系统进行冷却后的空气

D.APU引气活门上游来的空气