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【多选题】
有时，新雇员培训可能只需在不同的房间安装受训者在实际工作中将要使用的设备，但在很多时候，这种培训都需要使用模拟设备。例如，在飞行员培训中，模拟飞行器就有以下哪些优点A.
安全
B.
学习效率
C.
经费
D.
程序化
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
一个引脚接输入信号，一个引脚接低电平
B.
两个引脚都接低电平
C.
一个引脚接输入信号，一个引脚接高电平
D.
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【单选题】We can infer from the text that ______.
A.
the coach of Carlisle comes back from the Olympics.
B.
carlisle has a special edge over Ivy football powers.
C.
Americans treat football in the same way with other games.
D.
carlisle won several champions in the late 20th century collegiate game.
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