The abscissa at the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length x and measured counterclockwise from the point(1,0) if x is positive or clockwise if x is negative.

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The abscissa at the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system,the arc being of length x and measured counter clockwise from the point(1,0)if x is positive or clockwise if x is negative.

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No. X：號(hào)

X室 Room X | X號(hào) No. X | X單元 Unit X

X-unit：西格班

X-type 交叉形 | X-unit 西格班 | X-zerogear 零變位齒輪

XU X-unit X：?jiǎn)挝籟波長(zhǎng)單位

wpfg water-proofing防水性 | XU X-unit X單位[波長(zhǎng)單位=1010mm] | Y Y-pipe 叉形管