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1Shang wu Han yu ru men. Gateway to business Chinese. Regular formulas and etiquette /商务汉语入门. Gateway to business Chinese. Regular formulas and etiquette /Published 2005Book
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2Shang wu Han yu ti gao. Advanced business Chinese : social gatherings, office work, day-to-day operations /商务汉語提高. Avanced business Chinese : social gatherings, office work, day-to-day operations /Published 2005Book