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XICHANG, Sichuan, Oct. 24 (Xinhua) -- China launched an unmanned spacecraft early Friday to test technologies to be used in the Chang'e-5, a future probe that will conduct the country's first moon mission with a return to Earth.

The high speed led to hefty friction between the orbiter and air and high temperatures on the craft's exterior, generating an ion sheath that cut off contact between ground command and the orbiter.

Strengthening energy cooperation is of great significance to safeguarding the two countries' energy security, the two leaders agreed during their meeting ahead of the Asia-Pacific Economic Cooperation (APEC) Economic Leaders' Meeting slated for Nov. 10-11.

"Given the large funding gap between projected infrastructure needs and limited financial resources, we call for further efforts to attract long-term financing and leverage private resource flows to fill the gap, including through public-private partnership (PPP)," the statement said.

China has vowed to strengthen air pollution control. Smog-prone Beijing will adopt a special air pollution control plan for the upcoming APEC meetings, featuring temporary closure of factories in the event of a pollution warning.