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Pretreatment of sample surface included mechanical polishing, polishing, degreasing, chemical etching in a mixture of 10% hydrochloric acid and 10% sulfuric acids, thorough washing with distilled water, and drying.
To start with, all wafers were first cleaned by piranha solution (a mixture of 98%H2SO4and30%H2O2% H2O2 at 7 3 v/v) for about 30 min, followed by thorough rinsing with deionized water for several times.
A mixture of both.
A mixture of method and madness.
It's a mixture of the two.
Faces reflect a mixture of ethnic backgrounds.
Probably a mixture of all the above.
A mixture of invulnerability and indifference?
Maybe it's a mixture of both.
The solution is a mixture of both.
A mixture of all three?
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CEO of Professional Science Editing for Scientists @ prosciediting.com