Transit flight at Guangzhou and Urumqi airports (CZ)

Hello sir,
I will have flight to Moscow from Bangkok with China Southern (CZ).
But flight will stop at Guangzhou and Urumqi as following details.

Outbound : Sat 14 Nov 2015
Bangkok (BKK) - Guangzhou (CAN) / 0210 - 0600 / CZ3036
Guangzhou (CAN) - Moscow (SVO) via Urumqi / 11.35 - 19.35 / CZ6001

Inbound : Sat 21 Nov 2015
Moscow (SVO) - Guangzhou (CAN) via Urumqi / 2140 - 1355 (+1) / CZ6002
Guangzhou (CAN) - Bangkok (BKK) / 1600 - 1755 / CZ363

At Guangzhou, I will have to move between terminal 1 and terminal D to change the airplane. Do I have to pass immigration?

At Urumqi, I think it is technical stop (e.g. to re-fill the fuel).
I think I may not leave the airplane, I can sit in airplane during layover time.

Am I correct? Because I'm Thai. If I have to pass immigration, I must apply VISA in advance.
Sincerely thanks,