单项选择题

20世纪80年代，《伯杰氏细菌学鉴定手册》修订为《伯杰氏系统细菌学手册》。（）

A．对
B．错

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虚拟轴机床被誉为“机床结构的重大革命”、“21世纪机床”。（） A. 对 B. 错

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In this paper we develop a model for trajectory planning of air vehicle.
A、A. Explaining the significance or necessity of the research
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D、D. Announcing the purpose/focus of the study
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