单项选择题
It is very important for every sailor （）the characteristics of the ropes so that they can be for right jobs.
A.knowing
B.know
C.to know
D.knew
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This windlass （）now.
A. has repaired
B. is under repair
C. was repaired
D. had repaired -
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The blocks and gooseneck of the jumbo need （）.
A. dismantling and inspecting
B. dismantled and inspected
C. to dismantle and inspect
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One （）of the pilot ladder has been damaged. Please repair it at once.
A.step
B.shackle
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D.cable
