A.Determinestheambientlightatnightwithaphotocell.
B.Calculatessunsetandsunrisetimesbasedongeographicalarea.
C.Determinesthestartandendofeachoftheseasons.
D.Synchronizesthelocaltimedisplayedwiththeofficialworldtime.
参考答案：B
ADeterminestheambientlightatnightwithaphotocellBCalculate
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