线路的同一杆路上同时设有明线线担和电缆吊线担时,两种线担应设在不同杆面上。
参考答案:对
“梁上有双燕,翩翩雄与雌。……青虫不易捕,黄口无饱期。须臾十来往,犹恐巢中饥。”这主要反映了鸟的哪种繁殖行为
A.孵卵
B.育雏
C.筑巢
D.求偶
Don't let yourself be by a small failure in the experiment Try again.[ ]
A. turned down
B. cast down
C. put down
D. made down