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Experts believe_______people can waste less food by shopping only when it is necessary.
1年前
“Mobile phone killed my man,” screamed one headline last year.
1年前
公共场所常用“84消毒液”(NaClO溶液)进行环境杀菌。NaClO中Cl元素的化合价是________。
1年前
Mike couldn't________ swimming before.
1年前
设随机变量X~N(-1,22),N(-2,32),且X,Y相互独立,则X-Y~()
1年前