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principal escaped point
主遁点
在倾斜像片的主垂面W内,过摄影中心S作与摄影方向线VV的平行线,与像片主纵线vv的交点i称为主合点。
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direct current arc furnace steelmaking
direct current arc source
direct current bridge
direct current bridge, DC bridge
direct current, DC
direct current discharge
direct current fields in whole space
direct current Josephson effect
direct current motor
direct current motor, DC motor
direct current plasma
direct current plasma source
direct current plasma source (DCP)
direct current polarography
direct current power supply
direct current prospecting instrument
direct current sputtering
direct current tachogenerator
direct current transmission
direct-current transmitting methods of working face
direct current vohage gradient
direct current,DC
direct cutter
direct cutting
direct decomposition
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