题目

Some people bring out the best in you in a way that you might never have fully realized on your own. My mom was one of those people. My father died when I was nine months old, making my mom a single mother at the age of eighteen. While I was growing up, we lived a very hard life. We had little money, but my mom gave me a lot of love. Each night, she sat me on her lap and spoke the words that would change my life, “Kemmons, you are certain to be a great man and you can do anything in life if you work hard enough to get it.” At fourteen, I was hit by a car and the doctors said I would never在农村，农民常用质量分数为15%的食盐溶液进行选种．某农民需要1000g该食盐溶液，请你在实验室中帮助完成此项任务并回答下列问题：（1）配制该溶液时所需要的玻璃仪器为：______；（2）配制该溶液时所需食盐的质量为______g，称取食盐时，______加砝码（填先、后）；（3）若使用25%的食盐溶液（足量）进行配制，则需称（量）取25%的食盐溶液______g和水______ml；（4）若使用400g质量分数为5%的食盐溶液进行配制，则需称（量）取食盐______g和水______ml．