On cargo booms，preventers are（）.

1、A cargo boom is a（）.

A cargo boom is a（）.Adouble sized mattress consists of more than 890 coilsBspar extending from a mast or a king postCflap（Becker rudder）can...

2、The boom stops are installed on an off

The boom stops are installed on an offshore crane to（）.Aprevent the boom from being raised too highBprevent the boom from swingingCsupport the boom when not in useDprevent the boom from being lowered

3、0n cargo booms,preventers are（）.

0n cargo booms,preventers are（）.Aauxiliary guysBextra fair leadsCsteel bandsDsto

4、You are on a containership. The cargo

You are on a containership. The cargo includes a container of small arms ammunition，a container of lead-acid storage batteries and bottles of ...

5、Many dangerous cargoes are stowed on d

Many dangerous cargoes are stowed on deck because of the（）.Adanger to crew and cargoBnecessity of periodic inspectionCpossible need to jettisonDAll of the above

6、When a cargo boom or crane is rated at

When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to（）.Awinch speedBboom strengthCload radiusDcable strength