Iranian President Mahmoud Ahmadinejad unveiled on Wednesday a new generation of centrifuges for uranium enrichment.
In a live broadcast by state TV, a model of the fourth generation of domestically-made centrifuge was presented.
The head of the Atomic Energy Organization of Iran, Fereidoon Abbasi, said in the ceremony that his country activated the first cascade of the new generation of centrifuges at its Natanz nuclear enrichment site on Wednesday.
Abbasi added that the move will, to a great degree, speed up the country's uranium enrichment activities and is a strong response to Western hostilities.
Earlier on Wednesday, a report by the local satellite TV from Natanz city said the new generation of the centrifuge is made of carbon fiber and performs three times as efficiently as the third generation.
Ahmadinejad also said 3,000 more centrifuges had been added to his country's uranium enrichment effort.
The developments underlined Teheran's determination to forge ahead with its nuclear activities despite increasingly tough sanctions from the West - and speculation that Israel or the United States could be months from launching military strikes against it.
Iran portrayed the advances as evidence it was only interested in peaceful nuclear goals, under the slogan "nuclear energy for all, nuclear weapons for none".
Russian Foreign Minister Sergei Lavrov on Wednesday urged Teheran to cooperate with the world's nuclear energy watchdog to resume stalled talks.
"We would like to encourage the Iranians to work with the agency, we encourage strongly for them to continue dialogue on specific suspicions," Lavrov said at a news conference in The Hague on a two-day visit to the Netherlands.
Lavrov's visit to the Netherlands comes as tensions rose between the West and Iran over Teheran's nuclear activities, which the United States and its allies fear masks a drive for atomic weapons.
2017届高考英语一轮复习课时作业38:Unit 3《Inventors and inventions》(新人教版选修8福建专用)
2017届高考英语一轮复习课时作业17:Unit 2《Working the land》(新人教版必修4浙江专用)
2017届高考英语一轮复习课时作业11:Unit 1《Festivals around the world》(新人教版必修3福建专用)
2017届高考英语一轮复习课时作业18:Unit 3《A taste of English humour》(新人教版必修4浙江专用)
2017届高考英语一轮复习课时作业13:Unit 3《The Million Pound Bank Note》(新人教版必修3浙江专用)
2017届高考英语一轮复习课时作业30:Unit 5《The power of nature》(新人教版选修6福建专用)
2017届高考英语一轮复习课时作业19:Unit 4《Body language》(新人教版必修4福建专用)
2017届高考英语一轮复习课时作业14:Unit 4《Astronomy the science of the stars》(新人教版必修3浙江专用)
2017届高考英语一轮复习课时作业12:Unit 2《Healthy eating》(新人教版必修3福建专用)
2017届高考英语一轮复习课时作业34:Unit 4《Sharing》(新人教版选修7福建专用)
2017届高考英语一轮复习课时作业10:Unit 5《Music》(新人教版必修2浙江专用)
2017届高考英语一轮复习课时作业4:Unit 4《Earthquakes》(新人教版必修1浙江专用)
2017届高考英语一轮复习课时作业6:Unit 1《Cultural relics》(新人教版必修2浙江专用)
2017届高考英语一轮复习课时作业22:Unit 2《The United Kingdom》(新人教版必修5福建专用)
2017届高考英语一轮复习课时作业24:Unit 4《Making the news》(新人教版必修5福建专用)
2017届高考英语一轮复习课时作业16:Unit 1《Women of achievement》(新人教版必修4浙江专用)
2017届高考英语一轮复习课时作业20:Unit 5《Theme parks》(新人教版必修4福建专用)
2017届高考英语一轮复习课时作业29:Unit 4《Global warming》(新人教版选修6福建专用)
2017届高考英语一轮复习课时作业39:Unit 4《Pygmalion》(新人教版选修8福建专用)
2017届高考英语一轮复习课时作业23:Unit 3《Life in the future》(新人教版必修5福建专用)
2017届高考英语一轮复习课时作业25:Unit 5《First aid》(新人教版必修5福建专用)
2017届高考英语一轮复习课时作业7:Unit 2《The Olympic Games》(新人教版必修2浙江专用)
2017届高考英语一轮复习课时作业11:Unit 1《Festivals around the world》(新人教版必修3浙江专用)
2017届高考英语一轮复习课时作业33:Unit 3《Under the sea》(新人教版选修7福建专用)
2017届高考英语一轮复习课时作业9:Unit 4《Wildlife protection》(新人教版必修2浙江专用)
2017届高考英语一轮复习课时作业14:Unit 4《Astronomy the science of the stars》(新人教版必修3福建专用)
2017届高考英语一轮复习课时作业15:Unit 5《Canada—“The True North”》(新人教版必修3福建专用)
2017届高考英语一轮复习课时作业21:Unit 1《Great scientists》(新人教版必修5福建专用)
2017届高考英语一轮复习课时作业36:Unit 1《A land of diversity》(新人教版选修8福建专用)
2017届高考英语一轮复习课时作业13:Unit 3《The Million Pound Bank Note》(新人教版必修3福建专用)