It was___that they began to handle the major problem.A.until late afternoonB.not until lat
It was___that they began to handle the major problem.
A.until late afternoon
B.not until late afternoon
C.late afternoon
D.not late afternoon
It was___that they began to handle the major problem.
A.until late afternoon
B.not until late afternoon
C.late afternoon
D.not late afternoon
A、A
B、P(A)
C、{ <φ,a> , <φ,b> ,<{a},a>,<{a},b>,<{b},a>,<{b},b>, <a,a> , <a,b> }
D、{ <a,φ> , <b,φ> , <a,{a}> , <b,{a}> , <a,{b}> , <b,{b}> , <a,a> , <b,a> }
设集合A={a,b,c},B={a,b},那么ρ(A)-ρ(B)=______,ρ(B)-ρ(A)=______
A.{ a=b; b=a; }
B.{ b = a * b; a = b / a; b = b / a; }
C.{ t=a; a=b; b=t; }
D.{ a = a + b; b = a – b; a = a – b; }
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