当积冰开始形成时,要在观测簿当日的电线积冰“备注栏”分方向记载冻结现象符号和开始时间。
参考答案:错
— Excuse me. Have you seen my bike?
— Look at that one next to the red bike. Is it _____?
A. hers
B. his
C. yours
D. mine
限制克令吊吊钩组合进入吊臂头部的装置是:()
A.断电开关装置
B.液压限制装置
C.差动型限位装置
D.刹车限位装置