Monday
April 21, 2014

Homework Help: English-help

Posted by annie on Wednesday, January 5, 2011 at 4:52pm.

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?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

English - I need to revise these sentences. Can you please help me? 1) What ...
Chemistry - I have 2 questions on columns used in the Gas Chromatography-Flame ...
physics - A null type of instrument as compared to a deflection type instrument ...
Buisness Law - What is the function of a negotiable instrument? Describe the ...
English - 1. There is a thermometer in the instrument screen. 2. There is a ...
Statistics - Suppose that either of two instruments might be used for making a ...
Math - Suppose that either of two instruments might be used for making a certain...
Maths - Suppose that either of two instruments might be used for making a ...
Stats and Data - Suppose that either of two instruments might be used for making...
Math - instruments played in a band include a piano drum guitar and saxophone....

Search
Members