小区呼吸效应是指随着（）的增加（或减小），（）收缩（或扩大）的动态平衡现象
参考答案：用户；小区覆盖半径
It is suggested that the project ______ until all the preparations have been made. [ ]
A. is not started
B. won't be started
C. isn't to be started
D. not be started
电动吊篮的载重量，不得大于额定载荷的（）%。
A、50
B、60
C、80
