请回答下列问题 1氮磷镁3种元素中构成生�活动所需直接能源物质的元素是 � 构成细胞膜的元素是 � 2缺镁时植物叶片�黄 Template




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tomski请回答下列问题 1氮磷镁3种元素中构成生�活动所需直接能源物质的元素是 � coloring