ল্যাবরেটরির নিরাপদ ব্যবহার-১

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পরিবেশ বান্ধব পদ্ধতি হলো-
সিঃ বোঃ ২০১৭।
\(i.\) ম্যাক্রো পদ্ধতি।
\(ii.\) সেমি মাইক্রো পদ্ধতি।
\(iii.\) মাইক্রো পদ্ধতি।।
নিচের কোনটি সঠিক?

\(i\) ও \(ii\)
\(i\) ও \(iii\)
\(ii\) ও \(iii\)
\(i,\) \(ii\) ও \(iii\)
উপরের কোনটি নয়

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Ans: \(ii\) ও \(iii\)
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