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【简答题】
Part I Introduction (1- __ ) Part II Body: body 1 ( __ - __ ) body 2 ( __ - __ ) Part III Conclusion ( __ - __ ) (答题要求:答案加分号加空格 如1; 2; 3; 4; 5; 6; 7) ( 最后一个字写完后不要加空格和任何符号 )
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皮皮学刷刷变学霸
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【单选题】听力原文： In the early 180Os, the paper industry was still using rags as its basic source of fiber as it had for many centuries. However, the rag supply couldn't keep up with the growing demand for paper....
A.
wood pulp was of good quality
B.
wood pulp was very cheap
C.
rags were not enough
D.
rags could not be obtained in the U. S.
【简答题】35 六级精度以上的孔加工应用 方法加工,七级精度的轴加工可用 方法加工。
【简答题】35 六级精度以上的孔加工应用 方法加工,七级精度的轴加工可用 方法加工。
【单选题】听力原文： In the early 180Os, the paper industry was still using rags as its basic source of fiber just as it had for many centuries. However, the rag supply couldn't keep up with the growing demand for p...
A.
Publishers wanted higher quality paper.
B.
Paper made from rags deteriorated too quickly.
C.
Wood pulp had become too expensive.
D.
The supply of rags was insufficient.
【单选题】Using source transformation, the current in the circuit is:
A.
4.5∠
B.
9∠
C.
4.5∠
D.
9∠
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