单项选择题
The derrick can’t be ()(超载).
A.exceeded B.overloaded C.overtaken D.loaded
单项选择题 ()(摆动)the derrick to shore side.
单项选择题 When the derrick is stopped, the guy must be ()(收好).
单项选择题 When the derrick is topped, the guy must be ()(放松).