=VLOOKUP(A6&B6,IF({1,0},Sheet3!$A$3:$A$505&Sheet3!$B$3:$C$505,Sheet3!$Q$3:$Q$505),2,0)
=VLOOKUP(B103&D103,IF({1,0},Sheet3!$B$3:$B$505&Sheet3!$D$3:$D$505,Sheet3!$Q$3:$Q$505),2,0)
=VLOOKUP(B6&D6,IF({1,0},Sheet3!$B$3:$B$505&Sheet3!$D$3:$D$505,Sheet3!$T$3:$T$505),2,0)
{1,0} 和 2,0 是固定参数 不用理他