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【简答题】
说明下列羰基配合物V—C和C一O键长的变化情况： 配合物 V(CO)6- V(CO)6 键长(V—C) 193pm 200pm (1)配合物V(CO)6-的V—C键长为什么比V(CO)6中的要短? (2)这两种配合物中的C—O键长比自由的CO键长要短或长?
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【单选题】周期矩形脉冲序列的频谱的谱线包络线为( )
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