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【单选题】
结晶器的主要作用是（）。A.
让钢液通过
B.
使钢水形成一定厚度的坯壳
C.
便于保护渣形成渣膜
D.
都不是
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A.
Learn to read for the main idea.
B.
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C.
Focus on the major details.
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