( )是设计的第一阶段。
A．项目建议书
B．可行性研究
C．初步设计
D．技术设计
参考答案：C
After ________ seemed a hopeless wait, four coalminers trapped in the mine for 125 hours were finally rescued in Heilongjiang Province.
A．when
B．that
C．it
D．what
干酪样坏死
