题目：
在用氢气还原氧化铜的实验中，进行如下操作：①加热，②停止加热，③通入氢气，④停止通氢气．其正确的操作顺序是______（填序号），该反应中氢气是______剂，具有______性．
答案：
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参考答案：B
在用氢气还原氧化铜的实验中，进行如下操作：①加热，②停止加热，③通入氢气，④停止
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题型：填空题
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