营养改善项目中的效益是指由于改善措施增进人体健康而可能带来的社会效益和经济效益。
参考答案：对
小提琴发出悦耳的声音是因为琴弦在______，声音要靠______传播．
The ______ contract is a contract between a party who agrees to accept the risk and a party seeking protection from the risk.A. payment B. productionC. shipmentD. insurance
