Zhao Huanxin and Chen Weihua in Washington contributed to this story.
Zhong Nan contributed to the story.
Zhengzhou Yutong Bus and Foton Motor have put hydrogen fuel cell commercial vehicles into use. And China National Heavy Duty Truck Group has developed three hydrogen fuel cell models.
Zheng started her bed and breakfast business seven years ago and has ridden the rising wave of rural tourism, earning about 80,000 yuan (,400) a year.
Zhang went missing on her way to sign a lease on June 9. Investigators later announced that Zhang was kidnapped. Prosecutors allege that Christensen approached Zhang and lured her into his car.
Zhou Jinfeng, secretary-general of the China Biodiversity Conservation and Green Development Foundation, said junk dealers currently play an important role, especially in sorting waste, because the government's waste sorting and recycling measures are ineffective.
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Zhang, from the National Health Commission, said the commission will cooperate with education authorities to pressure local governments to carry out measures for control and prevention of nearsightedness among students, and improve monitoring of nearsightedness, he said.
Zhao Jintao, a police officer from Shenzhen special economic zone, said the oath-taking rally demonstrated Guangdong police's firm stance and capacity to fight against crimes and act as a deterrent to criminals.
Zhang was speaking at the launch of a national campaign to crack down on fishing violators on Monday in Xiangshan county of Ningbo, Zhejiang province.
Zhang resides in a yard he has rented on a mountaintop that is about 900 meters high and practically lives off the land.