骨科手术术前备皮需要的时间为
A．8小时
B．4小时
C．3天
D．1天
E．5天
参考答案：C
简述矿业投资评价中各种评价方法的运用。
The child tiptoed quietly to the bird. ________ into the forest when he was about to catch it.
A．Flew it away
B．Away flew it
C．Away it flew
D．Flew away it
