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化学就在我们身边，我们身边处处有化学，根据你所学过的化学知识，下列说法错误的是( )

　A．“请往菜里加点盐”中的“盐”特指食盐—NaCl

　B．体温表中的水银不是银，是金属汞

　C．日常生活中蒸馒头用的碱面主要成分是纯碱—Na₂CO₃

D．我们使用的铅笔笔芯是金属铅制成的