Full coverage: Successful Launch of Long March-7 Rocket

For more on this, we have Professor Yang Yuguang, from the China Aerospace Science and Industry Corporation and ....
Welcome.

Q1: There are 4 main satellite launch centers around the country, so why was the newest one, the Wenchang Center in Hainan Province, chosen for the Long March-7 launch? And why did the government choose this exact day to launch the rocket?

Q2: As we know the Long March 7 is a cargo rocket, so how different is it from the previous Long March rocket generations?

Q3: What kind of cargo will the Long March 7 transport and what will those items be used for?

Q4: What is the significance of the successful launch of the Long March 7 rocket?