" E; E, @) S1 X) F: I& D第七题我国铁路的基本知识) m8 Z3 M3 O, L _' C9 D(欢迎访问avcar:https://avcar.vip)
目前我国铁路的标准轨距为()( G+ R8 F/ V. B% \& e* B(欢迎访问avcar:https://avcar.vip)
A、1345mm B、1543mm C、1435mm4 b9 {( z" g/ T( S(欢迎访问avcar:https://avcar.vip)
$ ^" c& \1 l' |. H6 ~第八题食品科学的 ) P- j, M. Q* R利用美拉德反应不会() 4 X8 l' f2 b0 b; dA、产生不同氨基酸 B、产生不同的风味 ! e' w5 k8 t1 \3 y8 |6 XC、产生金黄色光泽 D、产生酸味成分 3 i5 v2 Y R* _- c ! H0 s" F( R3 Q7 H第九题化学英语题 ! ?) I) M0 n2 [* S8 B; kWhat is always correct about the molecular ion, M+, in a mass spectrum of a compound?- e+ v9 \: W, z3 g6 p; k! n(欢迎访问avcar:https://avcar.vip)
A. The M+ ion peak has the smallest m/z ratio in the mass spectrum.- P" W) e0 h; l$ A(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.; K5 ~& c& l( ?(欢迎访问avcar:https://avcar.vip)
C. The M+ ion is the most stable fragment formed during electron bombardment. 8 l6 w( ` E- a+ u% h: ND. The M+ ion peak has the greatest intensity in the mass spectrum.6 j- ?* R' d, y4 t0 g7 L8 I2 u% i% g! ?(欢迎访问avcar:https://avcar.vip)