在柱坐标下从微分波动方程出发，推导柱面光波的场分布，并利用远场近似条件导出当线光源与光轴成任意角度时，在垂直光轴方向的参考面上的复振幅表示。
The expression of complex amplitude is given in reference plane vertical to the optical axis by far-field approximation when the line source and the principal axis are at any Angle.
残煤开采是将过去已开采区留下的煤柱、不可采的煤柱，再进行复采。
In the residual coal mining, the retaining and non-mining pillars in the mined area in the past are for resumption of mining.
详细分析了条带煤柱复采时沿空掘巷的支护特点。
The supporting characteristics of roadways driving along next goaf in repeated mining of strip pillar were analyzed.
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