The boom indicator tells the operator

1、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

2、Sudden starts or stops of the boom is

Sudden starts or stops of the boom is likely to cause all of the following except（）.Abreaking a cargo runnerBparting guys topping liftsCcarrying away a blockDoverheating the resistors and eventually burning out

3、Please tell the stevedores to load the

Please tell the stevedores to load the cargo（）according to the respective figures.AtightlyBcloselyCsecurelyDstrictly

4、●The (72) tells the computer what to d

●The (72) tells the computer what to do.A(72)diskBmemoryCprogramDdata

5、The Urgency Signal（）indicates that the

The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.ASOSBXXXCTTTDPAN

6、0n a crane ,the boom indicator tells t

0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.Avertical positionBhorizontal positionCboom stop angleDminimum radius angle