重吊杆用于吊大的重件。（）<br>A:Heavy derrick is used for lifting large heavy cargo.<br>B:Derrick is used for lifting large heavy cargo.<br>C:Heavy derrick is used for lifting dry bulk cargo.<br>D:Derrick is used for lifting dry bulk cargo.

重吊杆用于吊大的重件。（）
A:Heavy derrick is used for lifting large heavy cargo.
B:Derrick is used for lifting large heavy cargo.
C:Heavy derrick is used for lifting dry bulk cargo.
D:Derrick is used for lifting dry bulk cargo.

出自：船舶水手证

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