冷却塔补充水量,应考虑蒸发损失水量、风吹损失水量和排污损失水量,一般按循环水量的()计算。
A.3%~5%
B.2%~5%
C.4%~6%
D.2%~6%
参考答案:B
We writing a letter of complaint to the manager himself.But we'd like to hear your opinion first.
A.have been thinking of
B.had thought of
C.were thinking of
D.thought of
抚育采伐可以降低森林火险级。