Water displacing corrosion inhibiting compound has been applied during construction on certain airplanes in the locations shown in this figure. Periodic reapplication in these, and other locations, is required to maintain effectiveness of this protection.
答案解析
解析：
水排斥防腐蚀化合物是在某些飞机结构上施加的，图中显示了这些位置。为了保持这种保护的有效性，必须定期重新施加该化合物。选项A正确地描述了这一点，指出了防水防腐蚀化合物的应用和定期重新施加以保持保护效果。选项B中使用了“水排斥”而非“防腐蚀”，选项C中提到了“防卡剂”而非“防腐蚀”，因此都不符合题意。因此，正确答案是A。
生动例子：就像我们在冬天需要定期给汽车打蜡以保护车身免受腐蚀和损坏一样，飞机上的防腐蚀化合物也需要定期重新施加以保持其保护效果。如果我们不定期给汽车打蜡，车身就会受到腐蚀，同样，如果不定期重新施加防腐蚀化合物，飞机结构也会受到损坏。因此，定期重新施加防腐蚀化合物就像给飞机“打蜡”一样重要。
相关知识点：
特定位置涂防锈剂需定期重新涂
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