4 ?, J9 }( {/ Z第七题我国铁路的基本知识2 Z6 c3 o0 x4 D% |4 s(欢迎访问avcar:https://avcar.vip)
目前我国铁路的标准轨距为() 0 M! J4 }$ @ t v4 [A、1345mm B、1543mm C、1435mm * h% c6 ?; m7 t2 J% H0 O* } & T) W4 B7 P0 B1 x+ R. l& d第八题食品科学的 ; c! h1 K+ J: n& J, @8 f& L利用美拉德反应不会() $ T/ t4 u6 o$ _; [$ ~* x, MA、产生不同氨基酸 B、产生不同的风味 / U8 n- P# {8 o: n5 |C、产生金黄色光泽 D、产生酸味成分 4 b* G+ K; m3 m A. \0 k, V; v8 w1 h+ m9 O(欢迎访问avcar:https://avcar.vip)
第九题化学英语题7 X J* l( x' O$ r. `1 |; Z9 w(欢迎访问avcar:https://avcar.vip)
What is always correct about the molecular ion, M+, in a mass spectrum of a compound? 5 l( V, h1 A+ r2 b& DA. The M+ ion peak has the smallest m/z ratio in the mass spectrum.. W/ x, Q" a: }; F5 a+ x(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.1 S% c( J" u; v# O, h: r(欢迎访问avcar:https://avcar.vip)
C. The M+ ion is the most stable fragment formed during electron bombardment.2 x W/ h9 E- c: x3 Q' A(欢迎访问avcar:https://avcar.vip)
D. The M+ ion peak has the greatest intensity in the mass spectrum. 7 l) {7 c# I! b) B# b; r/ Q8 D2 ^7 T" \(欢迎访问avcar:https://avcar.vip)
第十题采矿学 9 I$ N: v1 }+ n' `0 N! C根据所含金属种类不同,金属矿石可分为:______、 ______、 ______、______、和______。