由质量守恒原理： W-W+WE XW-XW+XEWE X（W+WB)=XAWA+XBWB WA (X-XA)=WE (XB-X) 即：WOA=WOB OB WA+1= OB +1 W: O4 WB Q4 Wa+WB_ OB+O4 W2 OA 2 2 由质量守恒原理： W=WA + WB XW=XAWA +XBWB X（ WA + WB ）=XAWA +XBWB WA（X-XA）= WB（XB -X） OA OB W W B A = +1 = +1 OA OB W W B A 即：WAOA=WBOB OA OB OA W W W B A B + = +