为什么老是提示单元7，8，9是0长度呢？

请高手帮忙呀！！！

重新弄好几遍了，机器也换了2台。都是不行，郁闷大了

:O 昨天也碰到这种情况，没找到原因，但又仔细的重做了一下，得出了结果。
是不是merge items那里时的问题？建议重做下下:O

/PREP7
ET,1,LINK1
R,1,0.5, ,
k,1,,
k,2,6,,
k,3,6,,3
k,4,0,,3
k,5,0,10,0
k,6,6,10,0
k,7,6,10,3
k,8,0,10,3
k,9,0,20,0
k,10,6,20,0
k,11,6,20,3
k,12,0,20,3
LSTR, 1, 2
LSTR, 2, 3
LSTR, 3, 4
LSTR, 4, 1
LSTR, 5, 6
LSTR, 6, 7
LSTR, 7, 8
LSTR, 8, 5
LSTR, 9, 10
LSTR, 10, 11
LSTR, 11, 12
LSTR, 12, 9
LSTR, 1, 5
LSTR, 5, 9
LSTR, 2, 6
LSTR, 6, 10
LSTR, 3, 7
LSTR, 7, 11
LSTR, 4, 8
LSTR, 8, 12
LSTR, 3, 8
LSTR, 2, 5
LSTR, 7, 12
LSTR, 6, 9
LSTR, 4, 5
LSTR, 3, 6
LSTR, 7, 10
LSTR, 8, 9
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,2.1e11
MPDATA,PRXY,1,,0.3
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,DENS,1,,7850
/VIEW,1,1,1,1
/ANG,1
/REP,FAST
/REPLOT
LPLOT
FINISH
/SOL
FINISH
/PREP7
FLST,2,28,4,ORDE,2
FITEM,2,1
FITEM,2,-28
LGLUE,P51X
FLST,2,28,4,ORDE,2
FITEM,2,1
FITEM,2,-28
LMESH,P51X
FINISH
/SOL
FLST,2,4,1,ORDE,4
FITEM,2,1
FITEM,2,-2
FITEM,2,8
FITEM,2,11
!*
/GO
D,P51X, , , , , ,ALL, , , , ,
FLST,2,1,1,ORDE,1
FITEM,2,38
!*
/GO
F,P51X,FY,-100
FLST,2,1,1,ORDE,1
FITEM,2,38
!*
/GO
F,P51X,FX,100
/STATUS,SOLU
SOLVE
然后就是错误提示

从你目前贴出来的命令流来看，7、8、9号线肯定不是零长度了！建议给出完整的命令流