primary ray 初生射线 ; 主光线 ; 所以他的初始鳍条 ; [物] 原射线
heavy metal ion primary ray 重初级射线
primary medullary ray 原生芒髓 ; 初生髓线
primary X-ray beam 原X射线束
primary cosmic ray [高能] 初级宇宙线 ; [高能] 初级宇宙射线
heavy cosmic ray primary 宇宙线重原始粒子
composition of primary cosmic ray 一次宇宙线的组成
Production principle, character and primary influence factors of Descartes ray are studied by experiments on the basis of theoretical analysis.
在理论分析的基础上，通过试验着重研究了纤维笛卡尔线的产生机理、特征和主要影响因素。
The presented results also include the relations between scattering factors with therapeutical fields and the distances of primary X-ray source and target plane.
比较的结果还包括均整块和初级准直器的散射与射野大小及离开X射线源距离之间的关系。
Objective To analyze the double contrast X ray findings of the primary gastric malignant lymphoma.
目的探讨原发性胃恶性淋巴瘤的双对比X线征象。
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