The upper spontaneous potential produced by oil and gas accumulation is of a stable potential field, and its intensity is directly proportional to the content o
The market share between China Mobile and China Unicom has stabilized since 2002.It is found that China Mobile has the superiority in the competition, for examp
A new concept of multi-shop (M) is put forward which contains all basic shops including open shop (O), job shop (J), flow shop (F) and hybrid flow shop (H) so t