单项选择题
Which action（s）should the operator of a pedestal crane take if crane control is lost （）.
A.Let go of both control levers and return to neutral position B.Press the emergency stop C.Notify the mate on watch D.All of the above
单项选择题 Which action（s）is/are included in crane operations（）.
单项选择题 What is a“Special Warning”（）.
单项选择题 What form of ice is of land origin（）.
