只有（）转矩大于（）转矩时，提升机才不会溜车。
参考答案：堵转；负载
With lots of trees and flowers _____here and there, the city looks very beautiful.
A．having planted
B．planted
C．have been planted
D．to be planted
软化水是指除去（）的水。
A、阳离子
B、钙、镁离子
C、溶解氧
D、阴离子状态杂质
