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【单选题】
普通、优质和高级优质钢是按钢的（）进行划分的。
A.
力学性能的高低
B.
S，P含量的多少
C.
Mn，Si的含量多少
D.
含碳量
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【单选题】听力原文：W：I can't understand why Jane isn't here yet．We agreed to meet at half past ten．It is almost eleven．And the conference will begin two hours later． M：She probably just got tied up in traffic．Let's...
A.
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【单选题】The adage, "There is no such thing as a free lunch," is used to illustrate the principle that
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goods are scarce.
B.
people face tradeoffs.
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all costs are included in the price of a product.
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【单选题】听力原文：W：I can't understand why Jane isn't here yet．We agreed to meet at half past ten．It is almost eleven．And the conference will begin two hours later． M：She probably just got tied up in traffic．Let's...
A.
They will go to the conference first.
B.
They will give up waiting for Jane.
C.
They will wait for Jane for a while.
D.
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查看完整题目与答案
【单选题】Rather than doing this via auction or through private art dealers they can give them to the government, which buys them at an agreed price ______ them
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after having, independently valuable
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查看完整题目与答案