! E/ `7 k5 X: V7 a第九题化学英语题 / ^: V+ V7 R# F+ _, CWhat is always correct about the molecular ion, M+, in a mass spectrum of a compound?' @. s6 o( } K* I; R/ c$ @(欢迎访问avcar:https://avcar.vip)
A. The M+ ion peak has the smallest m/z ratio in the mass spectrum. ) _9 h5 L$ R4 ~ JB. The m/z ratio of the M+ ion peak gives the relative molecular mass of the molecule.7 P! X r: A. _- a# V(欢迎访问avcar:https://avcar.vip)
C. The M+ ion is the most stable fragment formed during electron bombardment. 6 T% e: `. E& [( OD. The M+ ion peak has the greatest intensity in the mass spectrum. n' ?! f, E) A: z7 S3 g(欢迎访问avcar:https://avcar.vip)
9 I* A& E9 f. ~* D第十题采矿学 ' Y4 J2 G+ p4 E! b v, I根据所含金属种类不同,金属矿石可分为:______、 ______、 ______、______、和______。