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These should be covered in your textbook, possibly at the beginning or at the end as an appendix.
If the book doesn't clear it up, ask your teacher, because precautionary symbols are there for a reason-- to protect you from harm.
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Precautionary signs and symbols inside the laboratory?
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What are the Different Precautionary Measures that you have to observe in the laboratory?
sabay sabay natin kainin angtalong na torta
Precautionary measures before and after volcanic eruption?
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What is safety precautionary measures in Tagalog?
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taeh
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Until you specify what kind of laboratory, what kinds of materials and procedures, and the level of training of those using the lab, it is impossible to list precautionary measures that would be appropriate.Precautions that sometimes apply include:Wear goggles/face shieldWear an apron/lab coatTie long hair backDon't eat or drink in the labTest all safety equipment regularlyKnow where the gas shutoff valve isUse proper ventilation
What is the meaning of precautionary measurement?
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