ansys网格划分后的单元问题，请求大神指点！！！

** WARNING *** CP = 213.565 TIME= 22:41:16
No constraints have been defined using the D command.
*** WARNING *** CP = 213.675 TIME= 22:41:16
Quadrilateral element 6562 has a pair of opposite edges that are 74.16
degrees away from being parallel. This exceeds the warning limit of
70 degrees.
*** WARNING *** CP = 213.675 TIME= 22:41:16
Quadrilateral element 7841 has a pair of opposite edges that are 70.26
degrees away from being parallel. This exceeds the warning limit of
70 degrees.
*** WARNING *** CP = 213.706 TIME= 22:41:16
Quadrilateral element 7891 has a pair of opposite edges that are 70.26
degrees away from being parallel. This exceeds the warning limit of
70 degrees.
请大神指点一下这是什么问题?????
附：命令流如下：
FINISH
/CLEAR,START
*afun,deg
*set,a,30
X=COS(A)
Y=SIN(A)
L=8.7E-3
H=8.7E-3
Z=30E-3
/PREP7
et,1,shell181
r,1,4.9e-4
r,2,4.4e-4
r,3,2.2e-4
mp,ex,1,7.6e8
mp,prxy,1,0.3
mp,ex,2,3.6e8
mp,prxy,2,0.3
mp,ex,3,3.6e8
mp,prxy,3,0.3
k,1,0,0,0
K,2,L*X,L*Y,0
K,3,L*X,H+L*Y,0
k,4,0,l+2*l*y
k,5,0,2*l+2*l*y
L,1,2
L,2,3
l,3,4
l,4,5
lgen,5,1,4,1,,2*l+2*l*y,,,0,0
nummrg,kp
*get,nmax1,line,,num,max
cm,ldanyuan,line
*get,nmax,kp,,num,max
k,nmax+1,0,0,z
l,1,nmax+1
adrag,ldanyuan,,,,,,nmax1+1
arsym,x,1,20,1,,0,0
agen,10,1,40,1,2*l*x,,,,0,0
nummrg,kp
rectng,-l*x,19*l*x,0,10*l+10*l*y
wpoffs,,,z
rectng,-l*x,19*l*x,0,10*l+10*l*y
wpoffs,,,-z
nummrg,kp
aovlap,all
asel,s,loc,z,z,z
asel,a,loc,z,0,0
aesize,all,2e-3
mat,1
real,1
amesh,all
asel,a,loc,y,0,l*y
*do,i,1,9
asel,a,loc,y,i*h+i*l*y,i*h+(i+1)*l*y
*enddo
asel,inve
aesize,all,2e-3
mat,2
real,2
amesh,all
asel,s,loc,z,z,z
asel,a,loc,z,0,0
asel,a,loc,x,-l*x,-l*x
*do,i,1,20
asel,a,loc,x,(i-1)*l*x,(i-1)*l*x
*enddo
asel,inve
aesize,all,2e-3
mat,3
real,3
amesh,all