A.document.getElementById("tb").cells[2][1].style.background-color="
B.ff0000";
C.document.getElementById("tb").cells[2][1].style.backgroundColor="
D.ff0000";
E.document.getElementById("tb").rows[2].cells[1].style.backgroundColor="
F.ff0000";
G.document.getElementById("tb").rows[2].cells[1].style.background-color="
H、ff0000";
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