There are a great many different types of experiments, and they require different types of precautions. The general answer to the general question is, take all due precautions.
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What safety precautions should be taken
The precautions that must be taken during the experiment of transpiration
What precautions should be taken after a hurricane hits?
Safety precautions.
the temperature must be kept constant
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Precautions should be taken to protect patients from unnecessary exposure to radiation. Patients should be shielded with lead aprons as much as possible.
10 precautions to take when dealing with computer
precautions taken for cloudburst