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【多选题】关于使用总账系统制单，下列描述中正确的有（ ）。
A.
可查看任意科目的最新余额
B.
可控制操作员使用科目的权限
C.
凭证可按任意格式的文本文件引入和引出
D.
不能修改和删除其他子系统生成的凭证
【单选题】Ultralight (超轻型的) airplanes are a recent development in aviation that provide what aviation enthusiasts have long been seeking: born of the marriage of the hang glider and the go-kart (轻型单座赛车) engine ...
A.
the weight of the hang glider and that of the ultralight airplane
B.
ultralight airplanes and military aircraft
C.
the inventiveness of John Moody and that of Octave Chanute
D.
the controls used in the Wright brothers’ flyer and those used in today’s ultralight air-planes