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现在仪器的读数应当为零。
The instrument will now read zero.
youdao
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用大约5分钟的时间使仪器达到稳定，然后读取读数。
Allow about five minutes for the instrument to settle, then take a reading.
youdao
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用大约5分钟的时间使仪器达到稳定，然后读取读数。
Allow about five minutes for the instrument to settle, then take a reading.
youdao