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paper soaked in lead(II) acetate which is used to detection of sulfur compounds
Where can I buy this lead sugar paper?
paper machine
This paper machine produces high-quality paper.
where there is a will there is a way
He said, 'Where there is a will, there is a way,' and faced the difficult situation.
(philosophy) I think therefore I am
He strongly believes in the philosophical thought, 'I think, therefore I am.'
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DiQt（ディクト）
無料
★★★★★★★★★★
