一般建筑负荷包括非通信用空调设备、一般照明灯具和备用发电机组等不保证供电的其他负荷。()
参考答案:对
--- I called Nina several times, but she didn't answer.
--- Of course, she ____________ London for a visit. [ ]
A. has been to
B. has gone to
C. has been in
D. had gone to
在1:1000地形图上,若等高距为1m,现要设计一条坡度为4%的等坡度路线,则在地形图上该路线的等高线平距应为______m。