PDF形式で、「ワックスオイル・残油水素化装置の操作員技能鑑定」という書籍をお持ちの同業者の方はいらっしゃいますか？
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PDF形式の方はいらっしゃいますか
ワックスオイルの電子版は見たことがないけど、タオバオで本を買えばいいよ〜。基板上に関するもので、百度では見つからないPDF版なんて、ほとんど誰も作っていないから、実物の本を買った方が見やすいよ~~~~
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