Officers observe ships with a pair of __（望远镜）.A.sextantB.binocularsC.compassD.radar
Officers observe ships with a pair of __（望远镜）.
A.sextant
B.binoculars
C.compass
D.radar
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Pair类表示“有序整数对”，考虑该类应具有的必要数据和行为，写出该Pair类的定义。