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Challenge 1: Can you spot all the exhaust fans in the picture below?
挑战1：你可以找出下面图片中所以得排风机吗？
Exhaust fans maintain a lower pressure in the pump room than in any other part of building.
排风扇使泵房内的空气压力比建筑物内其它房间的压力低。
If alarm for high bearing temperature occurs on any one of the main exhaust fans, the local monitor will indicate the actual bearing.
如果任何一个主风机发生轴承温度高报警，本地检测可以检测出是哪一个轴承。
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