单项选择题

How should you signal the crane operator to lower the boom and raise the load（）.

A.Extend arm and point finger in the direction to move the boom
B.Extend arm with thumb pointing downward and flex fingers in and out
C.With forearm vertical and forefinger pointing up，move hand in small horizontal circles
D.With arm extended downwards and forefinger pointing down，move hand in small horizontal circles

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单项选择题

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

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

单项选择题

Damage by（）shall not be considered as handling damage.

A.exposure to inclement weather conditions
B.carelessness
C.the use of improper gear
D.moisture caused by condensation

单项选择题

Cargo handlers should take the following precautions with the exception of（）to avoid damage from shifting.

A.Keep the loads as close to the rail or deck as possible
B.If cargo is likely to settle，make provisions to secure it after it has settled
C.Thoroughly secure and shore all cargo so that it cannot move
D.hen stowing cargo，avoid leaving empty paces