【单选题】X=
{a, b, c, d, e}, A= {a, b, c, d}, R=
{(a, a), (b, b), (c, c), (d, d), (e, e), (a, b), (d, c), (b, c ), (a,
c), (e, b), (a, d), (e, d), (e, a), (e, c)}, 求(X,R)的cover
A. Cover={ ( a, b), (b, c), ( a, d), ( e, a ), ( e, b ) } B. Cover={ ( a, b), (d, c), (b, c), ( a, d), ( e, a )} C. Cover={ ( a, c), (d, c), (b, c), ( a, d), ( e, a )} D. Cover={ ( a, b), (d, c), (b, c ),( a, c), (e, b), ( a, d), (e, d), (e, a), (e, c )}
{a, b, c, d, e}, A= {a, b, c, d}, R=
{(a, a), (b, b), (c, c), (d, d), (e, e), (a, b), (d, c), (b, c ), (a,
c), (e, b), (a, d), (e, d), (e, a), (e, c)}, 求(X,R)的cover
A. Cover={ ( a, b), (b, c), ( a, d), ( e, a ), ( e, b ) } B. Cover={ ( a, b), (d, c), (b, c), ( a, d), ( e, a )} C. Cover={ ( a, c), (d, c), (b, c), ( a, d), ( e, a )} D. Cover={ ( a, b), (d, c), (b, c ),( a, c), (e, b), ( a, d), (e, d), (e, a), (e, c )}
举一反三
- SPEAK : DRAWL:: A: (A) eat : sip B: (B) run : canter C: (C) lament : sigh D: (D) gain : cover E: (E) look: glance
- is the last part of a paper to write. A: Abstract B: Keywords C: Reference D: Acknowledgement E: Cover letter
- 设集合X={a,b,c,d,e}，集合X上的二元关系R={(a,b),(b,c),(c,d),(d,e)}，则R的传递闭包为[img=44x21]180380e93cb7cf8.png[/img]{(a,b),(a,c),(a,d),(a,e),(b,c),(b,d),(b,e),(c,d),(c,e),(d,e)}。
- Journal is to article as () A: dance is to ballet B: magazine is to cover C: set is to scenery D: anthology is to poem E: concert is to orchestra
- SPEAK: DRAWL :: A: eat: sip B: run: canter C: lament: sigh D: gain: cover E: look: glance