净出口是指一定时期内一国的出口值大于进口值。( )
参考答案：错
Prince William said he was delighted that the 2012 Olympic Games ________ in London.
A．would be held
B．would hold
C．will be held
D．will hold
（）的火花暗红比较短，流线极细，尾粗扁，尾花羽毛亮，飘闪。
A、低碳钢
B、中碳钢
C、高碳钢
D、铸铁
