【多选题】
A Please prepare for stand-by engine before 1813
B Stand-by engine has been carried out before 1830.
C Please make the preparation for stand-by before 1830.
D Stand-by engine has been finished before 1813.
E 请在18:13前准备好备用发动机
F 备用发动机是在18:30年以前开始使用的。
G 请在18:30年之前准备好备车
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