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【单选题】
Questions 5 to 8 are based on the conversation you have just heard.A.
Those learning independently.
B.
Those mastering advanced technologies.
C.
Those qualifying for leading positions.
D.
Those adapting to new professions.
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【简答题】超声波液位计是利用( )测距原理进行工作的。由于超声波可以在不同介质中传播,所以超声波液位计也分为:气介式、液介式及固介式三类,最常用的是气介式和液介式。
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