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【单选题】
一对渐开线标准直齿圆柱齿轮传动的正确啮合条件是（ ）。A.
两轮齿数相等
B.
两轮模数相等
C.
两轮齿距（基节）相等
D.
两齿轮压力角相等
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【简答题】第一单元测验题.doc
【简答题】第十一单元测验题.doc
【简答题】第一单元测验简答题.doc
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【单选题】Critics have argued that an ________ commercial focus will lead researchers to ignore pure science.
A.
extreme
B.
extra
C.
excessive
D.
expensive
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