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【单选题】
【第22~24次课】工件以V形块定位时，合成公式的应用条件为（ ）。A.
在任何情况下都可以应用
B.
在定位元件为V形块时即可应用
C.
在工件及V形块均正放时即可应用
D.
在工件和V形架均正放、工件定位及加工部位为同一轴径时即可应用
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举一反三
【简答题】Listen to the passage and fill in the blanks with the exact words you hear. Most people like to keep a healthy 1) _____ during the holiday season starting from Thanksgiving to Christmas and New Year. ...
【单选题】听力原文： Before World War n, we spent our summer holidays in Hungary. I have only the dim memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparents...
A.
He was first of all a scientist.
B.
He was not only a naturalist but also a scientist.
C.
He was no more than a born naturalist.
D.
He was a scientist as well as a naturalist.
【单选题】听力原文： Before World War II, we spent our summer holidays in Hungary. I have only the dim memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparent...
A.
Because the family was extremely large.
B.
Because he didn't live very long with them.
C.
Because he was too young when he lived with them.
D.
Because he was fully occupied with observing nature.
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