2 D7 D% P' K, o" v! o第九题化学英语题 [: X# I1 C1 ?" dWhat is always correct about the molecular ion, M+, in a mass spectrum of a compound? + k6 r G% j, k" k3 EA. The M+ ion peak has the smallest m/z ratio in the mass spectrum. 5 x4 Q6 V7 X/ l5 ~4 x" eB. The m/z ratio of the M+ ion peak gives the relative molecular mass of the molecule.2 x$ J- S5 O( o% b, z(欢迎访问avcar:https://avcar.vip)
C. The M+ ion is the most stable fragment formed during electron bombardment.$ y9 U% s8 V) N" W(欢迎访问avcar:https://avcar.vip)
D. The M+ ion peak has the greatest intensity in the mass spectrum. 0 L1 Z8 }* X) y% F4 T, j# w4 `* a8 ?' H9 ]; w(欢迎访问avcar:https://avcar.vip)
第十题采矿学* n3 C8 A9 c7 J6 ~, g, a! o(欢迎访问avcar:https://avcar.vip)
根据所含金属种类不同,金属矿石可分为:______、 ______、 ______、______、和______。