( a+ y5 m9 y& q0 E! C. C) C4 \1 w8 L第九题化学英语题9 X5 `- y+ a- G7 r! \ _(欢迎访问avcar:https://avcar.vip)
What is always correct about the molecular ion, M+, in a mass spectrum of a compound?2 d0 T- X2 @8 C) F3 C# h(欢迎访问avcar:https://avcar.vip)
A. The M+ ion peak has the smallest m/z ratio in the mass spectrum.: B0 r7 j! @" P h3 k: S- v/ l! b$ c(欢迎访问avcar:https://avcar.vip)
B. The m/z ratio of the M+ ion peak gives the relative molecular mass of the molecule.4 U9 Q# H7 k$ y; ~$ V7 _4 t& c(欢迎访问avcar:https://avcar.vip)
C. The M+ ion is the most stable fragment formed during electron bombardment.; y9 N/ T9 M$ u; I(欢迎访问avcar:https://avcar.vip)
D. The M+ ion peak has the greatest intensity in the mass spectrum. # ^( S; P7 z/ c, M ' a1 C3 F) ]$ b" C第十题采矿学6 K* H0 t# t* }. G(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