【多选题】
A The emergency generator should be started in half an hour
B The emergency generator has run for half an hour.
C Start the emergency generator and run it for half an hour.
D The emergency generator was started half an hour ago.
E 应急发电机应在半小时内启动
F 应急发电机已经运行了半个小时了。
G 启动应急发电机然后让他运行半个小时。
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