空相，汉语词语，指此即是空的相状。
海空相遇行为准则 rules of behavior for air and maritime encounters
光纤复合架空相线 OPPC
航空相片 aerial print ; aerophotograph
真空相变 phase transition of vacuum ; vacuum phase-change
航空相片转绘仪 aerial photograph converter
真空相变热水锅炉 vacuum phase-change hot water boiler ; change hot water boiler
航空相片转绘 airphoto transfer
复合架空相线 OPPC
航空相机 aerial camera ; aviation camera
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