f(5)=f(2)=f(-1)=2-1=12.
故选C.
He left the room and then _____ into another one. [ ]
A. gets
B. got
C. was getting
D. to get
下列减少循环水冷却塔飘洒损失的措施中正确的是()。
A.减少上塔水量
B.保持配水设施的良好运行使布水均匀
C.在保证供水温度的前提下尽量减少风机运行数量
D.保持收水器完好