单项选择题
When the derrick is stopped, the guy must be（）.
A. take in B. slacked off C. stowed D. taken
单项选择题 （）cargo has different characteristics and forms of packaging. They may be in bags, bundles, cases or steel drums.
单项选择题 All the cargo wires must be greased （）.
单项选择题 （）has the ship?
