You can actually upgrade as many suits as you like before finishing this quest. This is because Crocket never complains about lack of chemicals as long as you say you're getting the armour on behalf of Dr Jing. Getting an upgrade will make the quest dialogue option disappear, but just return to Jing and "reactivate" the quest, then go to Crocket again and follow the quest dialogue for another suit (promising him yet more fuel). Keep going back and forth until you have all the upgrades you need.
引用第6楼novarain于2012-03-23 09:31发表的 :
but just return to Jing and "reactivate" the quest, then go to Crocket again and follow the quest dialogue for another suit (promising him yet more fuel).