生产150方,当三流的拉速小于()m/min时,结晶器增压泵点自动关闭。
A、3.0m/min
B、2.5m/min
C、2.0m/min
参考答案:C
关于各种指标的评价标准错误的是()。
A.若Pt>Pc,可以考虑接受该项目
B.NPV(ic)≥0,考虑接受该项目
C.当IkR≥ic时,NPV≥0,考虑接受该项目
D.NPVR(ic)≥0,考虑接受该项目
In fact, the room was not made to be a gift. It designed for the palace of Frederick I. However, the next King of Prussia, Frederick William I, whom the amber room belonged, decided not to keep it. In 1716 he gave them to Peter the Great. And then , the Czar sent him a troop of his best soldiers. So the Amber Room became part of the Czar’s winter palace in St Petersburg. Late, Catherine II had the Amber Room moved to a palace outside St Petersburg when she spent her summers. She told her artists to add more details in it. In 1770 the room was completed the way how she wanted. Almost six hundred candles lit the room, and it’s mirrors and pictures shone like gold. Sad, although the Amber Room was considered one of the wonders of the world, it is now missed.