单项选择题
The drive motor will have a brake arranged to fail-safe, ieit will （） the load if power fails or machine is stopped.
A.lift B.put C.take D.hold
单项选择题 （） are used to handle anchors and chains.
单项选择题 Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?（）
单项选择题 （） are used for cargo handling.
