單項選擇題

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

A.With both arms extended out and palms to down, move arms back and forth
B.With arm ertended downwards and forefinger pointing down,move hand in small horizontal crecles
C.Extend arm and point finger in the direction to move boom
D.Place both fists in front of the body with the thumbs pointing outward

你可能感興趣的試題

單項選擇題

How should you signal the crane operator to use the main hoist?（）.

A.Use one hand to give any miotion signal , and place the other hand motionless in front of the hand giving the motion signal
B.Extend arm with the thumb pointing up , and flex the fingers in and out for as long as the load movement is desired
C.First tap your elbow with one hand , and then proceed to use regular signals
D.First tap the top of your head with your first , and then proceed to use regular signals

單項選擇題

I have steerage way.It is said that（）.

A.I am underway
B.I am out of control
C.I am not making way through the water
D.I have the amout of movement forward which the ship need to be steered properly