______,there was a revival in literacy.A.The early Middle AgesB.The late Middle AgesC.The
______,there was a revival in literacy.
A.The early Middle Ages
B.The late Middle Ages
C.The Middle Ages
D.None of all
______,there was a revival in literacy.
A.The early Middle Ages
B.The late Middle Ages
C.The Middle Ages
D.None of all
集合A={a1,a2,a3,a4},R={(a1,a2),(a2,a3),(a3,a4)},求r(s(R)),s(r(R)),t(s(R)),r(t(R)),t(r(R))。
设A={1,2,3),R={(1,2),(2,1),(1,3),(1,1)),求r(R),s(R),t(R).
A.R = (1 r) T
B.D = (1 r) R
C.r = (1 r) T
D.R = (1 r) D
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