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【单选题】
BCl 3 分子几何构型是平面三角形, B 与 Cl 所成键是A.
（ sp 2 —p ） σ 键
B.
（ sp—s ） σ 键
C.
（ sp 2 —s ） σ 键
D.
（ sp—p ） σ 键
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