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kaubatooted on erinevad ja ei ole võimalik kindlaks määrata optimaalseid vee ja isopropanooli suhtelisi koguseid, mida tuleks kasutada teatava toote katsetamisel, sest see suhe on iga kord erinev.
the diversity of commercial preparations is such that it is not possible to specify the optimum relative proportions of water and isopropanol to be used in testing a given product, as this will vary from case to case.