They represent the initial phase of a planned constellation capable of beaming signals for high-speed internet service from space to paying customers around the globe.
They were first sent to Asahi Noyu Farm in Japan to study how to grow high-quality rice, as none of them had farming experience.
They also sent him a 6-meter-long painting of the ancient town as a gift.
They removed the last two nickel-hydrogen batteries from the station's backbone near the port solar array and moved them to an external platform. The batteries will be stored there until they can be disposed of in the next Japanese cargo spacecraft.
They also ordered an investigation into possible dereliction of duty among food and drug officials, and vowed stern punishment for those involved.
They also said that they would protect Yu's family if requested.
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They expect well-equipped dormitories with gyms, laundries and entertainment rooms.
They also worked out that one recycle station should be set up for every 500 villagers, which would achieve the highest utilization rate. And it was most economical for a truck to carry 30 tons of recyclables in each trip.
They are the first pair of six such ships which, upon completion, will be operated by the Wuhan New Port Administration Committee, based in Hubei province. All six vessels are expected to be put into operation by June 2019.
They visited attractions including the DPRK-Russia friendship pavilion and a monument in memory of naval commander Yi Sun-sin in Rason. The three-hour sightseeing trip was led by a tour guide from Rason, and wrapped up around 1 pm, when the tourists returned to Hunchun, the city government said.