我把你的命令流稍微调整一下，中间有些改动，你看看！
/PREP7
ET,1,LINK1
R,1,0.01
R,2,0.005
R,3,0.0125
MP,EX,1,2.1E11
MP,PRXY,1,0.3
n,1
n,2,6
n,3,12
n,4,18
n,5,24
n,6,6,8
n,7,12,8
n,8,18,8
TYPE,1
MAT,1
REAL,1
E,1,2
E,2,3
E,3,4
E,4,5
E,6,7
E,7,8
REAL,2
E,2,6
E,3,7
E,4,8
E,3,6
E,3,8
REAL,3
E,1,6
E,5,8
FINISH
/SOLU
D,1,all
D,5,all
F,6,FY,-200000
F,8,FY,-200000
F,2,FY,-400000
F,3,FY,-400000
F,4,FY,400000
SOLVE
FINISH
/POST1
esel,s,type,,1
etable,,smisc,1
etable,,smisc,7
plls,smis1,smis7,-0.05,0
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