【单选题】【消耗次数：1】
铁片和稀硫酸制取氢气时，下列措施不能使氢气生成速率加快的是（）。
①
不用铁片，改用铁粉
②
不用稀硫酸，改用98％浓硫酸
③
加热
④
滴加少量<img class="kfformula" src="20200629/1593407049192822.png" data-latex="{CuSO}_{4}" width="70" height="29"/>溶液
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