SNSSNNSN 相关知识点: 试题来源: 解析 3.【解析】本题考查的主要知识点为:地球的公转。结合我们所学并观察二分二至图可知,a点为夏至,b点为秋分,c点为冬至,d点为春分。由于元旦最接近的节气是冬至。故地球公转位置在c点附近。故C正确,ABD错误。【答案】C4.【解析】本题考查的主要知识点为:地球的公转。A,...
下面4个数都是六位数,N是比10小的自然数,S是0,这个六一定是3和5的倍数的数是( )A.NNNSNNNNNSNN B.NSNSNSNSNSNS C.NSSNSSNS
下面四个数都是自然数,其中N是任意自然数,数字S等于0,一定能同时有因数2和3的数是( ) A. NNNSNN B. NSSNSN C. NSNSNS D. NSSNS
A total of 54 SnSn, 120 SnNn, and 20 mixed Sn(S and N)n fragments with n=2–8 were retrieved from the Cambridge Structural Database and analyzed using the bond valence sum method. New R0 values of 2.391(14) for Sn S and 2.058(20) for Sn N were derived and can be used to ...
119Sn-NMRExchange Reactions119Sn-NMR spectra of a 1:1 mixture of [(CH3)2SnS]3 (1) and [(CH3)2SnNC2H5]3 (2) were recorded to demonstrate the utility of 119Sn-FT-NMR in exchange reactions.doi:10.1515/znb-1979-1025B. Goliński