$ M3 n4 W* l8 p第七题我国铁路的基本知识4 k' k" U9 z* @(欢迎访问avcar:https://avcar.vip)
目前我国铁路的标准轨距为() 9 \6 x9 R( v1 X/ w( [0 @; rA、1345mm B、1543mm C、1435mm F, q5 }6 Q* Y; A % [" S: G$ e4 r7 m2 Y第八题食品科学的 9 O r0 {8 t/ N8 r利用美拉德反应不会()3 _* J b& w% @& L. l(欢迎访问avcar:https://avcar.vip)
A、产生不同氨基酸 B、产生不同的风味: G0 @. y4 m- ]$ M7 z$ K& z& f(欢迎访问avcar:https://avcar.vip)
C、产生金黄色光泽 D、产生酸味成分 , k8 c( R7 I% o$ x" A1 V) z& J1 X3 B- }; h$ V(欢迎访问avcar:https://avcar.vip)
第九题化学英语题9 s. [" f( T2 Q7 d(欢迎访问avcar:https://avcar.vip)
What is always correct about the molecular ion, M+, in a mass spectrum of a compound? / T5 a+ H' x6 e4 @A. The M+ ion peak has the smallest m/z ratio in the mass spectrum.# @1 L$ F8 F! U. U(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. # B3 X3 C3 X8 _6 k1 v( a! \C. The M+ ion is the most stable fragment formed during electron bombardment. % m# y) M4 F+ x) [" t9 O( `D. The M+ ion peak has the greatest intensity in the mass spectrum. 9 m. {, N: I3 {4 R( l- ~3 {+ E( u3 J: p 1 @( t, S0 E1 N6 d2 O第十题采矿学 # X2 w4 y$ B# u3 P根据所含金属种类不同,金属矿石可分为:______、 ______、 ______、______、和______。