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t 2 x"+tx'-x=0． 求方程的通解：
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举一反三
【单选题】听力原文：M: Would you mind my opening the door of the classroom? W: No, of course not. Q: What does the woman mean? (12)
A.
Please open the door.
B.
Don't open the door.
C.
She is not sure whether to open the door.
D.
She doesn't agree.
【单选题】It was not just the size of the party last night_________made it unique, but_____ it meant to our company.
A.
what; that
B.
that; what
C.
what; what
D.
that; that
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