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【单选题】
链传动设计中,一般链轮最多齿数限制为zmax=120,是为了( )。A.
减小链传动的不均匀性
B.
减少磨损后链从链轮上脱落下来
C.
限制传动比
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A.
正确
B.
错误
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A.
as
B.
that
C.
so
D.
for
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A.
because
B.
which
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who
D.
that
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A.
上皮细胞层损伤后能再生
B.
基质层占角膜厚度的80%
C.
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D.
前弹力层无细胞结构
E.
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A.
which
B.
because
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since
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that
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