• 2022-07-28
    已知表达式P[x, f(y), B]的两个置换为:s1={z/x, w/y},s2={q(z)/x, A/y},则以下选项正确的是( )
    A: P[x,f(y),B]s1= P[z/x,f(w/y),B]
    B: P[x,f(y),B]s2= P[q(z),A,B]
    C: P[x,f(y),B]s1= P[z,f(w),B]
    D: P[x,f(y),B]s2= P[q(z),f(A),B]