8 n# u* Z8 y* a. v5 m9 y: h2 e第九题化学英语题; L) Y; t# q& s( N(欢迎访问avcar:https://avcar.vip)
What is always correct about the molecular ion, M+, in a mass spectrum of a compound? n, V/ s! f- q0 W4 l1 KA. The M+ ion peak has the smallest m/z ratio in the mass spectrum. ; d2 _: o5 W/ q% }: E; tB. The m/z ratio of the M+ ion peak gives the relative molecular mass of the molecule. ! J. c0 a. i v. U# D) CC. The M+ ion is the most stable fragment formed during electron bombardment.( U! o% V, ?* @: k(欢迎访问avcar:https://avcar.vip)
D. The M+ ion peak has the greatest intensity in the mass spectrum. ?: W5 j7 \# u6 E(欢迎访问avcar:https://avcar.vip)
6 p1 M. p( O) B: e9 {6 h(欢迎访问avcar:https://avcar.vip)
第十题采矿学 . O) ^: m" G4 F- `9 Q: l根据所含金属种类不同,金属矿石可分为:______、 ______、 ______、______、和______。