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