单项选择题
A.mapB.filterC.flatMapD.reduce
A.I.nput和OutputB.T.ransformation和ActionC.T.ransformation和OutputD.I.nput和Action
A.12B.14C.16D.18
A.4020B.4030C.4040D.4050
微信扫一扫,加关注免费搜题