| No. | Producing areas |
| S1 | Wuzhong, Ningxia, China | S2 | Wuzhong, Ningxia, China | S3 | Wuzhong, Ningxia, China | S4 | Wuzhong, Ningxia, China | S5 | Guyuan, Ningxia, China | S6 | Guyuan, Ningxia, China | S7 | Lanzhou, Gansu, China | S8 | Lanzhou, Gansu, China | S9 | Wuwei, Gansu, China | S10 | Dingxi, Gansu, China | S11 | Dingxi, Gansu, China | S12 | Qingyang, Gansu, China | S13 | Baiyin, Gansu, China | S14 | Chifeng, Inner Mongolia, China | S15 | Chifeng, Inner Mongolia, China | S16 | Ordos, Inner Mongolia, China | S17 | Lvliang, Shanxi, China | S18 | Alaer, Xinjiang, China | S19 | Ili Kazak Autonomous Prefecture, Xinjiang, China | S20 | Ili Kazak Autonomous Prefecture, Xinjiang, China | S21 | Harbin, Heilongjiang, China |
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