单项选择题
Please adjust the derrick （）(向上).
A.upwards
B.downwards
C.forwards
D.backwards
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The （）(袋装货) can’t be unloaded by hooks.
A. bagged cargo
B. drummed cargo
C. cased cargo
D. deck cargo -
单项选择题
Please adjust the derrick （）(向下).
A.upwards
B.downwards
C.forwards
D.backwards -
单项选择题
The （）(箱装货) should be handled by cargo tray.
A. bagged cargo
B. drummed cargo
C. cased cargo
D. packed cargo
