慢性肾衰竭患者低蛋白饮食时，必须保证给予充足热量目的是______________________。
参考答案：减少蛋白质消耗
— Mum, may I have some cakes?
— Sorry, there’s ______ left in the box. I’ll go and buy some for you tonight.
A．nothing
B．no one
C．no
D．none
涉外经济合同当事人在合同发生纠纷时同时选择仲裁和诉讼解决。( )
