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বিপদ সংকেত কি?

Md. Saifur Rahman

রাসায়নিক দ্রব্যের সম্ভাব্য বিপদ নির্দেশক আন্তর্জাতিকভাবে স্বীকৃত চিহ্নসমূহকে বিপদ সংকেত বলে।

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