在营养学中，矿物质是指( )
A．金属元素
B．宏量元素
C．微量元素
D．微量元素、宏量元素
E．金属元素、微量元素
参考答案：D
A new stadium ___ at present in our city.Work on it ___ in another two months.
A, is built, will complete B. is being built, will complete C. is being built, will be completed D. is building, will be completed
永久气体气瓶的充装量是指气瓶在单位容积内允许装入气体的( )。
A．最大压力
B．最大体积
C．最大质量
D．最大密度
