单项选择题
This is a（）（折叠）type hatch cover.
A.folding
B.rolling
C.side-rolling
D.unfolding
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Sailors also keep （）（舷梯）watch.
A.deck
B.bridge
C.gangway
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Don’t （）(系牢) the guy here.
A.fasten
B.unfasten
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Oil pumped ashore by ships’（）（油泵）.
A. pine
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C. oil pump
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