题目

用铁片与稀硫酸反应制取氢气时，下列措施不能使氢气生成速率加大的是 (     )A．加热                              B．加入硝酸钠固体C．滴加少量CuSO4溶液                D．不用铁片，改用铁屑  答案：B解析:略 ( ) How_______these fish?A. much is B. much are C. many is D. many are