How should you signal the crane operator to raise the boom?().

A . Extend arm with the thumb pointing up and flex the fingers in and out B . Place both fists in front of the body with the thumbs pointing upward C . With forearm vertical and forefinger pointing up,move hand in small horizond circles D . Extend arm with the fingers closed and thumb upward

时间:2022-10-09 18:37:50 所属题库:航海英语综合练习题库

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