节流装置中孔板最简单，价格最便宜，但在相同差压下，其压力损失最大。
参考答案：对
It is reported that Russia uses____ energy as Uklaine.
A．as twice much
B．twice as much
C．twice much as
D．twice much
建设工程项目管理的时间范畴是建设工程项目的（）阶段。
A．决策
B．实施
C．定义
D．保修
