1. In this paper we deal with some properties of cobordism classes of fiber bundles over the real projective space.
   本文研究了底空间为实射影空间时上协边类纤维丛表示的若干性质.
2. According to the theory of scalar diffraction, first, the equipollence of spatial distribution of the plane-wave interferential field and parallel projective sine grating is discussed.
   摘要根据标量衍射理论，首先讨论了两平面波干涉场的空间分布与平行投影正弦光栅的等价性。

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