# E f$ W. e% T0 [第九题化学英语题6 }/ g4 t' b; m7 Z, d(欢迎访问avcar:https://avcar.vip)
What is always correct about the molecular ion, M+, in a mass spectrum of a compound?+ p) I/ [' M e(欢迎访问avcar:https://avcar.vip)
A. The M+ ion peak has the smallest m/z ratio in the mass spectrum. ( _3 m' j' Y1 Z7 cB. The m/z ratio of the M+ ion peak gives the relative molecular mass of the molecule. ) F0 f9 d1 ~( X4 @+ P1 A0 MC. The M+ ion is the most stable fragment formed during electron bombardment. / s6 [8 c d; ]$ I+ ] xD. The M+ ion peak has the greatest intensity in the mass spectrum.2 X+ }1 _ s1 J' A: `! M+ c, T# Y1 r. C(欢迎访问avcar:https://avcar.vip)
& o& j3 J2 C& `& f* I, f(欢迎访问avcar:https://avcar.vip)
第十题采矿学 7 Q* @9 c; x3 e7 V) ~) ~' P8 u根据所含金属种类不同,金属矿石可分为:______、 ______、 ______、______、和______。