长沙市妇幼保健院始建于
参考答案：
1962年，1987年由所改院。
若n（n≠0）是关于x的方程x2-mx-4n=0的根，则m-n的值为______．
The Customs shall reply in writing within ______ from the date of receipt of the application for the refund of the duty paid and notify the applicant of its decision.
A．one month B．two monthsC．three monthsD．six months
