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【单选题】
在直齿圆柱齿轮的规定画法中,分度圆和分度线用 ( ) 绘制。A.
虚线
B.
细实线
C.
粗实线
D.
点画线
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举一反三
【单选题】The book tells small business owners that
A.
there will be many things that they couldn't manage．
B.
they could get encouragement from the book．
C.
they should achieve their respective goals in various ways．
【简答题】管状组织的表里纬的投纬比应为:(__________________ )。
【简答题】A．Because there is not a single 'e' in that book. B．Because there are many French words in that book. C．Because the English translation of that book is strange. D．Because the translator doesn't manage...
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