# i) ?) F( v: h7 R6 |" l第九题化学英语题/ I( ?+ m+ k7 e4 y( W/ f3 `0 G(欢迎访问avcar:https://avcar.vip)
What is always correct about the molecular ion, M+, in a mass spectrum of a compound? # u' z o7 J) T- W4 HA. The M+ ion peak has the smallest m/z ratio in the mass spectrum. + R% e$ n* |. v `2 ~B. The m/z ratio of the M+ ion peak gives the relative molecular mass of the molecule. ) `4 {# H% q3 Q( l4 A; J7 {C. The M+ ion is the most stable fragment formed during electron bombardment. 0 {4 E1 R/ Z! G# CD. The M+ ion peak has the greatest intensity in the mass spectrum. ' ~4 q+ t, \ S+ A+ F0 |3 o& F% @6 H* ^(欢迎访问avcar:https://avcar.vip)
第十题采矿学* `, i" X. ~; ]) F! @& j(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