纳税评估是税源管理工作的基本内容，是（）的重要手段。
A.营造和谐税收
B.处置税收风险
C.纳税服务
D.促进纳税遵从
参考答案：B, D
When I was in London,at first I had no idea where I could my RMB for pounds. [ ]
A.charge
B.exchange
C.change
D.chance
泵内能量损失包括哪几方面？
