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[主观题]
There are ______ flights from Shanghai to Hong Kong every week.A.2B.4C.6D.8
There are ______ flights from Shanghai to Hong Kong every week.
A.2
B.4
C.6
D.8
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There are ______ flights from Shanghai to Hong Kong every week.
A.2
B.4
C.6
D.8
第2题
A.对其产生冲刷,但不会有更大影响
B. 渣铁在炉缸内形成环流,环流长期对炉缸砖衬冲刷和侵蚀使炉缸炉底出现蒜头状破损,严重时会造成烧穿事故。
C. 因有死铁层,对炉缸寿命不会有太大影响。
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