【判断题】矿物质又称无机盐,主要有钙、钠、铁、碘、钾等。
【简答题】5,10,9.5,9,( ),( )。10.5,10,9.5,9,( ),( )。
【单选题】矿物质又称( ),是人体不可缺少的物质,在( )中存在较多。
【简答题】A tour of the company Stephan is taking a group of apprentices around the company: Right now, we're going to go this way round, past Reception on our left and the library on our right.Opposite the lib...