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【简答题】
已知某Fe 2 O 3 样品中铁元素的质量分数为63%(杂质不含铁元素),求此氧化铁样品中的质量分数.
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malfuntion
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failure
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criticizing certain aspects of the city
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romanticizing city life in a bygone era
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pointing out how city life could be improved
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blaming urban problems on city residents
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overloading
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【单选题】Which of the following sentences does NOT contain an attributive clause?
A.
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B.
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C.
My father ’ s words, which are heartfelt and sincere, touch my heart.
D.
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【单选题】The emergency bilge suction or bilge _____ is used to prevent flooding of the ship.
A.
injection valve
B.
relief valve
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discharge valve
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inlet filter
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