The center said drivers should slow down to safe speeds, while airports, freeways and ports should take appropriate safety measures.
The city's thermal power group said the incident happened possibly because some taxi drivers opened the manhole cover to steal water and clean their vehicles, but forgot to put it back on.
The cities of Beijing and Tianjin, along with Hebei province, will allow 144-hour visa-free entry for nationals from certain countries and regions by the end of 2017, a vice-mayor of Beijing said on Thursday.
The channel was reopened in the truce village of Panmunjom on Wednesday afternoon after Seoul on Tuesday proposed high-level talks between both sides on Jan 9 to discuss issues including the Democratic People's Republic of Korea's participation in the 2018 Winter Olympics.
The city in the eastern Zhejiang province, dubbed the "World's supermarket", receives more than 550,000 overseas buyers and sells commodities to more than 210 countries and regions every year.
The central bank Monday cut the reverse repo rate, a key interbank interest rate, to 2.5 percent from 2.55 percent, the first such cut of its kind since 2015.
都匀前列腺手术多钱
The city, known for its many lakes, invited its citizens to show off their homegrown lotuses and share their insights, tips and stories in planting the flowers, which thrive every summer.
The cities of Mudanjiang and Suifenhe in Heilongjiang province were hit by snowfall on Thursday evening.
The city authority said that 18 percent of the expats working in Shanghai are deemed as high-end talent from overseas, and both the number and quality of foreign talent introduced to Shanghai were ranked first in the country.
The chemical, papermaking and pesticide industries have been undergoing structural changes in response to the country's environmental protection policies. Public companies that have met with the country's environmental protection requirements have shown positive fiscal performance.