A.Cranes are more difficult to secure for sea
B.The spotting area of the conventional gear is larger
C.A crane operator requires more training than the winch operator of a yard and stay rig
D.The yard and stay rig is more flexible in its ability to handle a wider variety of cargoes
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最新試題
When using slings，cargo handlers should take all the following precautions except（）.
Which part provides for transverse control and positioning of a boom in a conventional yard and stay system（）.
What is/are the advantage（s）of cranes over conventional cargo booms（）.
How should you signal the crane operator to lower the boom and raise the load（）.
What is meant by the term“l(fā)uffing the boom”of a crane（）．