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並前往https://books.google.com.tw/books?id=-CnNwT3Sz8YC&pg=PA352&lpg=PA352&dq=spirit+level+meter&source=bl&ots=7osCJCkua5&sig=ACfU3U3E9-RcAbVzjAY9gHEuogGoaqN3yA&hl=zh-TW&sa=X&ved=2ahUKEwj8jdCQ3sb1AhWiyosBHWd4D4IQ6AF6BQiMAxAD

Journal of Research of the National Bureau of Standards

... the bubble in the spirit level on the meter through one half its length . ... worse than careless use of a meter with respect to leveling : The tests ...

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