7 19.5T-万.=k T+(叫1+士【n+m))=(4m1+m2 3T≈÷(mr+M+士m=N+(+3+3m) 2:42)+士号+计+言 +3 19.6 T=支甲+士叫甲+(中)平 t÷支mg(-甲 =+-4)中 9.8 丁=xM×↑m(t) B=4(2Mx+2m×+吗5-4 mx s Caf sa阝+X
2 2 2 2 48 7 ) 4 1 ( 12 1 J ml m ml z = + = 2 2 1 ) 4 ( l J z ≠ J z + m 2 1 3 1 19.1 J ml z = 19.8 19.6 19.5