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具有致泻作用的是
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利用酸碱滴定法测定物质含量的反应，绝大多数没有外观上的变化，因此必须借助酸碱指示剂颜色的改变来指示终点的到达。
一旦企业与银行签订周转信贷协议，则在协议的有效期内，只要企业的借款总额不超过最高限额，银行必须满足企业任何时候任何用途的借款要求。 ( )
Americans usually eat three meals a day. Breakfast usually comes before eight o’clock in the morning. They usually have eggs, some meat, bread, fruit juice and coffee. Lunch, is between twelve and one o’clock. It is a light meal and working people most take lunch with them or get it near their workplace. Children in school take sandwiches, fruit, and cookies with them or eat in school. Supper, the main meal, is between six and eight in the evening. People cook it carefully. They may have meat or chicken, turkey or duck. They may all have potatoes or rice, vegetables or salad. The drink is coffee, tea or milk. Then comes the dessert. ______ is the most important meal in a day.
以M表示金属离子，Y表示EDTA，MY表示它们的络合物，则MY的稳定常数K的表达式为K=[MY][Y]/[MY]。
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