将4mol SO₂与2molO₂放入4L的密闭容器中，在一定条件下反应达到平衡：2SO₂+O₂⇌2SO₃测得平衡时混合物总的物质的量为5mol，求：

下列体现可持续发展思想的是（　　）

— I'm sorry I broke your glass.
—           .

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