Asked by annie
1)Let the instrument switch on for 1 hour before analysis.
2)On the instrument for 1 hour before analysis.
3)Switch on the instrument and leave it on for 1 hour before analysis.
4)Switch on the instrument and conduct the analysis after 1 hour.
5)Turn on the instrument and allow a 1 hour warm-up period before analysis.
Which sentence(s) is/are acceptable?
2)On the instrument for 1 hour before analysis.
3)Switch on the instrument and leave it on for 1 hour before analysis.
4)Switch on the instrument and conduct the analysis after 1 hour.
5)Turn on the instrument and allow a 1 hour warm-up period before analysis.
Which sentence(s) is/are acceptable?
Answers
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