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【简答题】
钢的淬透性主要决定于( )，钢的淬硬性主要决定于( )。
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A.
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B.
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C.
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D.
make up
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A.
end
B.
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C.
edge
D.
tip
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【单选题】A fast food restaurant is the place ______ , just as the name suggests, eating is performed quickly.
A.
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