Youtube上的频道如 Welding and NDT


3,390,000 1.13%

726,000 2.06%

3,210,000 2.78%

13,800 2.34%

760,000 1.68%

524,000 2.7%

181,000 5.37%





1,820,000 2.61%

48,300 2.99%


61,100 3.84%

17,900 4.86%

51,900 1.57%

37,300 2.68%

119,000 2.16%



277,000 13.0%

681,000 1.7%

610,000 1.56%

10,000 3.02%