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TEHRAN - China and Iran on Saturday signed several agreements on infrastructure and trade cooperation, a fact further testifying to the already strong political and economic ties between the two countries.

He Guoqiang, a senior official of the Communist Party of China (CPC) who is currently on a three-day official visit to Iran, and Iranian Vice President Mohammad-Javad Mohammadizadeh witnessed the signing ceremony.

Under the agreements, Chinese companies will invest heavily in some major infrastructure projects in Iran, including a water diversion project and a dam. Chinese companies will also import large quantities of chrome ore and celestine from Iran.

China and Iran established diplomatic relations in 1971 and bilateral relations have developed steadily in recent years.

In 2010, bilateral trade reached a record 29.3 billion U.S. dollars, increasing by 38.5 percent over the previous year. China has also given financial and technological support to some major infrastructure projects in Iran.