如图，在Rt△ABC中，∠C=90°，D为AC上一点，且DA=DB=5，又△DAB的面积为10，那么DC的长是（ ）

2016年3月16日，十二届全国人大第四次会议表决通过《中华人民共和国慈善法》，2016年9月1日正式实施，标志着我国慈善事业进入法治化时代。这说明（       ）

阅读短文，判断下列句子“正确”还是“错误”。

    Which Skirt to Wear?

    Tina is 8 years old, and follows her own ideas. When her parents tell her to do something, she always doesn't do it. Today, she will go to a friend's birthday party. She is now choosing skirt to wear. She has three skirts: a blue skirt, a white one and a yellow one. She asks her father, “Which one is the best?” her father says, “I think the blue one is the best.” Then she asks her mother, “Which one do you think is the best?” Her mother answers, “The white one, of course!” Tina says, “Thank you.” Then she puts on the yellow skirt and goes out.

某溶液中存在大量的H^＋、Cl^－、SO₄^2－，该溶液中还可能大量存在的是