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【单选题】
在水中,氨( )能够腐蚀(Cu)的原因是:A.
在水中,氨（ ）能够显碱性,因此能够腐蚀（Cu）
B.
在水中,氨（ ）是生源性物质,因此能够腐蚀（Cu）
C.
在水中,,氨（ ）能够和（Cu）形成铜氨络离子
D.
在水中,氨（ ）是能够转化为 ,因此能够腐蚀（Cu）
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Promote other economies.
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【简答题】名词解释： 递远递减运价
【单选题】听力原文： The king has taken a knock. Nokla warned that the U. S. slowdown is now extending to other economies, and said that is cutting into demand for Nokia' s handsets, and for its growing mobile infra...
A.
Cutting into demand for Nokia' s handsets.
B.
Promote other economies.
C.
Many firms break down.
D.
Many handsets don' t sell.
【单选题】听力原文： The king has taken a knock. Nokia warned that the U. S. slowdown is now extending to other economies, and said that is cutting into demand for Nokia's handsets, and for its growing mobile infras...
A.
Cutting into demand for Nokia's handsets.
B.
Promote other economies.
C.
Many firms break down.
D.
Many handsets don't sell.
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