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【单选题】
防止铸件产生裂纹的基本方法之一是（）
A.
提高铸件金属的硫、磷含量，
B.
提高浇注温度，
C.
使铸件壁厚均匀，
D.
提高型砂质量，
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【单选题】Recently, the government considered adding an excise tax on CDs that can be used to record music and CD players that can record discs. If this tax was enacted, we would expect:
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相关题目：
【简答题】阅读小天地。 Hello, I'm Simon. I am eleven. And this is my friend Sarah. She is very cute. We like music. And we like sports, too. Sarah doesn't like math. Her uncle is a math teacher. Now we are in our new...
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little poverty and even less downright misery
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B.
鲁山山行》
C.
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【单选题】Recently, the government considered adding an excise tax on CDs that can be used to record music and CD players that can record discs. If this tax was enacted, we would expect:
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that consumers would pay a higher price and producers would sell fewer of these CDs and CD players than before the tax.
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