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Abrasive materials
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polycrystal materials
polycrystal materials
polycrystal materials
例句：
1
In
generally
,
there
were
some
crystal
defects
in
the
polycrystal
materials
,
and was namely the in perfect
crystal
structure
.
多
晶
材料
中
通常
存在
一些
晶体
缺陷
，
称之为
晶体
结构
的
不
完整性
。
热词推荐
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异性恋
形吊灯
拓扑
man
,
.
Facebook
you
say
a
"
Yeah
after
's
not
then
as
what
to
of
fff
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