(3)链转移反应：H+C2H6&RARR；C2H5+H2(3-29)CH3+C2H6&RARR；C2H5+CH4(3-30)CH3+E*&RARR；CH2+H(3-31) CH2 + E * & RARR CH + H (3-32) CH + E * & RARR; C + H (3-33) (4)
