C. The oil drain port drains the oil from the APU oil tank.
泄油孔从APU的滑油箱将滑油泄出
The location of oil drain port is at the bottom of the APU oil tank.
泄油孔的位置在APU滑油箱的底部
http://imgur.com/PoZDpci
The oil drain port has an oil pump screen, two packings, an adapter
assembly and slotted cover.
泄油孔包含一个滤网 两个油封 一个转接器总成跟一个开孔的cover
http://imgur.com/SOPuH6l
是说图中我也没看到滤网及另一个油封在哪
可能藏在adapter assembly里吧XD
The adapter assembly and slotted cover increase the rate of oil drainage
from the APU oil tank and prevent accidental oil spillage during the oil
drainage procedure.
转接器总成及开了孔的cover会增加APU滑油箱的排油速率
并防止在泄油过程中发生意外性的漏油
The oil filler cap is located on the top right side of the APU oil tank.
APU滑油箱的加油盖在APU滑油箱的右上方
The APU oil Tank is full when the oil level is at the center of the
top sight glass.
如果油面达到上窥视孔的中间 APU滑油箱就满了
用小画家画起来应该是像这样
http://imgur.com/1ZbWTqc
不太专业的翻译
希望能帮到你 考试加油