题目内容

2.

A. To finish her work.
B. To attend a meeting.
C. To get an important paper.
D. To meet somebody.

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3.

A. She’s a student.
B. She’s is a secretary.
C. She’s an engineer.
D. She’s a teacher.

4.

A.A list.
B.A product.
C.A contract.
D.A book.

5.

A.Where to have the meeting.
B.When to have the meeting.
C.Who to have the meeting.
D.What to discuss at the meeting.

如果一个振动的质点同时参与两个垂直方向,同频率的振动时,此质点的运动轨迹一般是椭圆

A. 对
B. 错

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