... distance between lines 辐射线间距离 distance marks 距离标记 distance measuring equipment 测距设备 ...
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distance of fiducial marks 框标距 ; 柑标距
At a railway crossing not watched by any one, warning marks shall be set up at a certain distance from the crossing.
无人看守的铁路道口，应当在距道口一定距离处设置警示标志。
Inspection distance between draught marks and keel plate after marking out.
划线后检查吃水标尺至平板龙骨之间的距离。
The sniper sighted his marks from a distance and often near the safety of a highway exit ramp.
这个放冷枪的人从远处，而且通常是靠近高速公路出口的缓坡这样安全的地方寻找目标。
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