单项选择题

乘客氧气系统一般采用：( )

A．高压氧气瓶
B．低压氧气瓶
C．氧气发生器
D．同时采用

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单项选择题

The differences between a research article and a review article mainly falls on:
A、the number of researches covered in the article
B、the difference between primary research and secondary research
C、the literature section
D、the conclusion section

外方位元素

答案：用以确定摄影瞬间摄影机或像片空间位置，即摄影光束空间位置的数据。