单项选择题

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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单项选择题

In this paper we develop a model for trajectory planning of air vehicle.
A、A. Explaining the significance or necessity of the research
B、B. Reviewing the existing literature relevant to the present study
C、C. Identifying a gap in the existing literature
D、D. Announcing the purpose/focus of the study
E、E. Outlining the paper structure

多项选择题

提单根据承运人是否在提单上加列货物外表状况不良的批注,分为()。

A．清洁提单
B．不清洁提单
C．直达提单
D．转运提单