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【单选题】
应用倒角命令“chamfer”进行倒角操作时A.
不能对多段线对象进行倒角
B.
可以对样条曲线对象进行倒角
C.
不能对文字对象进行倒角
D.
不能对三维实体对象进行倒角
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反馈参考答案：
举一反三
【单选题】We regret having received your offer too late, BECause we ____ our needs elsewhere.
A.
already cover
B.
already covered
C.
have already cover
D.
had already covered
【单选题】We regret to ________ you that our library will be closed next Wednesday, Thursday and Friday for the sports meeting. [ ]
A.
say
B.
speak
C.
inform
D.
notice
【单选题】If we ________ now to protect our mother river ---Li Jiang River , we ‘ll live to regret it.
A.
haven’t acted
B.
won’t act
C.
don’t act
D.
hadn’t acted
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