複数投票はOKですが1項目1票でお願いします。
How do you do? slimex 15 plus avis They used an alloy of sodium and potassium, which is a liquid at room temperature, to make sure that a nice clean drop of metal would make rapid, clean contact with the water - and to stop the metal oxidising on the way, they dropped it in a tube full of argon, rather than air.