题目内容
一对渐开线齿轮制造好后,实际中心距与标准中心距稍有变化时,仍能够保证恒定的传动比,这个性质称为( )。
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The immediate constituents of the sentence “Poor John ran away.”are ______and ______.
Immediate Constituents Analysis is a way to dismantle a grammatical construction in _______.
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