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【单选题】
应用最广泛的是（）螺纹，其牙型角为60°，同一直径按螺距大小可分为粗牙和细牙两类。A.
普通螺纹
B.
管螺纹
C.
梯形螺纹
D.
矩形螺纹
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【简答题】脂类的营养功能有哪些？
【简答题】Identify the main figures of speech in the following sentences and translate the sentences. 1. During World War II Hitler attempted to carry fire and sword into every part of the world. 2. But big nos...
【简答题】Name the figures of speech used in each of the following sentences. Her rich relatives rained birthday presents on her only son. ____________. He looked as if he had just stepped out of fairytales and...
【简答题】脂类的营养功能有哪些？
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