, a0 O& A4 n. u! v' F {第九题化学英语题 * n0 t* o+ |% d& ]% g5 A: \1 F9 pWhat is always correct about the molecular ion, M+, in a mass spectrum of a compound?: u2 f& {" u' O' Y# i4 E! c(欢迎访问avcar:https://avcar.vip)
A. The M+ ion peak has the smallest m/z ratio in the mass spectrum.( [# U3 _' i1 K6 _+ T(欢迎访问avcar:https://avcar.vip)
B. The m/z ratio of the M+ ion peak gives the relative molecular mass of the molecule.; y* D2 u( {) B1 k$ u(欢迎访问avcar:https://avcar.vip)
C. The M+ ion is the most stable fragment formed during electron bombardment. \& O" r" ?1 g# P(欢迎访问avcar:https://avcar.vip)
D. The M+ ion peak has the greatest intensity in the mass spectrum. " m) b5 E( M1 D- N f 1 Z. i' J' W0 ]' d: P9 v第十题采矿学 ! @& t, }+ q8 l4 I根据所含金属种类不同,金属矿石可分为