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A.30° B.60° C.120° D.150°
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A.-1 B.-2 C.-3 D.-4
A.1 B.2 C.3 D.4
a←1
b←2
c←3
a←b
b←c
c←a
Print a，b，c
a＝________，b＝________，c＝________．
