在托盘天平的两托盘上各放一只烧杯，分别注入足量的稀盐酸，天平

在托盘天平的两托盘上各放一只烧杯，分别注入足量的稀盐酸，天平平衡。向左边烧杯中加入10g金属锌，向右边烧杯中加入10g金属镁，当反应停止后，天平指针的指向是 ( )

A．分度盘的左边

B．分度盘的中间

C．分度盘的右边

D．三种情况都有可能

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在托盘天平的两托盘上各放一只烧杯，分别注入足量的稀盐酸，天平

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