[考題] 航海英文..
正在念航海英文考古題，發現有一題知道答案後還是不知道為什麼得選他!!
故上來請教各位前輩。
The required number of dual ______ nozzles are on board, and each
fire hose together with any necessary fittings and tools kept ready
for use in a conspicuous position near water service hydrants or
connections.
A.usage
B.alternatives
C.purpose
D.selection
答案是C.purpose
雙重目的?是為了哪兩個目的，前後文有些看不太懂。
還請各位前輩幫幫我!!
感謝。
--
Lights will guide you home.
And ignite your bones.
And I will try to fix you.
by Coldplay
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