单项选择题
A.mast B.master C.must D.derrick
There are some （）(贯穿螺栓) in the toolbox.A. through bolts...
单项选择题There are some （）(贯穿螺栓) in the toolbox.
A. through bolts B. nuts C. bolts D. split pins
All the （）(金属板) and paint are to be supplied by the shi...
单项选择题All the （）(金属板) and paint are to be supplied by the shipyard.
A.plates B.plastics C.boards D.materials
Sailors have to spend most of their time in （）(除锈) and ...
单项选择题Sailors have to spend most of their time in （）(除锈) and painting.
A.derusting B.cleaning C.repairing D.closing
