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The main precautions to take if a gas cylinder sign is present in the lab visually check that the gas cylinder is restrained, but keep a safe distance from it. The correct option is c.
Precautions are the preventive steps that are taken to save yourself from any dangerous circumstances. These steps are always taken in doing experiments and other scientific procedures.
Here, the precautions are to check the gas cylinder.
Thus, the correct option is c, Visually check that the gas cylinder is restrained, but keep a safe distance from it.
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The question is incomplete. Your most probably complete question is given below:
Remove the strap from around the gas cylinder to use it in the lab.
Open the valve on the gas cylinder periodically to release pressure.
Visually check that the gas cylinder is restrained, but keep a safe distance from it.
Test out the regulator on the gas cylinder to make sure it is working properly.