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单词
pitch line
释义
WordReference Random House Unabridged Dictionary of American English © 2024
pitch
′
line′,
[
Mach.
]
Mechanical Engineering
See
pitch circle.
Mechanical Engineering
an imaginary line within the profiles of the teeth of a rack, such that it moves against, and at the same rate as, the pitch circle of an engaging pinion.
1790–1800
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更新时间:2026/3/6 6:23:22