单项选择题
A.爪镶 B.包镶 C.轨道镶 D.钉镶
A.91.5% B.58.5% C.37.5% D.75%
A.2倍 B.3倍 C.4倍 D.5倍
A.钯、铜、铁、锡 B.钯、钌、铑、铱、锇 C.钯、钌、锗、铱、锇 D.钯、钌、锗、铱、铬
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