单位元群

And find that each element in the group can be decomposed into the product of two quaternion component matrices.

指出SO(4)群中每个矩阵都可以分解为两种单位四元数分量矩阵乘积的形式。

Simons [30] proved the non-existence theorem for stable integral current in acompact Riemannian submanifold isometrically immersed into a unit sphere andvanishing theorem for homology groups. In 1984, Y. L. Xin [47] generalized theLawson-Simons nonexistence theorem for stable integral current and vanishingtheorem for homology groups to the case of compact submanifolds in Euclideanspace, and gave several important applications.

Simons运用Federer-Fleming存在性定理[19]和几何测度论中变分技巧证明了单位球面中紧致黎曼子流形上稳定积分流的不存在性定理和同调群消没定理[30]。1984年，忻元龙将Lawson-Simons稳定积分流的不存在性定理和同调群消没定理拓广到了欧氏空间中紧致子流形的情形，并给出了若干重要的应用[47]。1997年，K。

Key units to be protected Province: Xianxian the "zhou ya fu 's Tomb","Gao Graves," thetao cheng qu "Bowen Tower,""kong ying da 's Tomb,""Security Bridge", thegu cheng xian "Qinglin Temple Pagoda" Shenzhen City, the "Portrait Monument since Ma","big business Han Feng","meaning deep billion state surplus warehouse," thezao qiang xian "Dong Zhongshu stone", Anping County, the "Eastern Han tomb murals,"" West Zhaizi tomb "Jizhou city," the tomb mound,"" Jizhou the Old City site,"" Han de head "," North Sai Stone ", the" double-mound tomb "wu yi County"窦shi Castle "and" angle of Han."

省重点文物保护单位：景县的&周亚夫墓&、&高氏墓群&，桃城区的&宝云塔&、&孔颖达墓&、&安济桥&，故城县的&庆林寺塔&，深州市的&马君起造像碑&、&大冯营汉墓&、&深州盈亿义仓&，枣强县的&董仲舒石像&，安平县的&东汉壁画墓&、&西寨子古墓&，冀州市的&后冢墓&、&冀州旧城址&、&西元头汉墓&、&西堤北石塔&、&双冢汉墓&，武邑县的&窦氏青山&和&中角汉墓&。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。