$ F3 J0 q/ _ y& F第七题我国铁路的基本知识% A* S5 k8 |+ J) q% _/ c- Q(欢迎访问avcar:https://avcar.vip)
目前我国铁路的标准轨距为()5 y9 ~+ r. K0 ^, P8 }(欢迎访问avcar:https://avcar.vip)
A、1345mm B、1543mm C、1435mm ! K8 V- Z7 U" z4 J& j & @& D+ m, G. j, }* r$ A第八题食品科学的 " |% _9 U, i0 ^' G利用美拉德反应不会() & o2 L7 F/ X: Y4 K9 R" M8 pA、产生不同氨基酸 B、产生不同的风味& C8 f" G1 Y8 z8 Z6 T; }' b- y, N(欢迎访问avcar:https://avcar.vip)
C、产生金黄色光泽 D、产生酸味成分 9 W: w; w" H* S5 w/ {' _ 4 _7 y* d2 [8 |3 K: K第九题化学英语题/ u. S6 j+ I5 S7 Z(欢迎访问avcar:https://avcar.vip)
What is always correct about the molecular ion, M+, in a mass spectrum of a compound?9 Q" j( J7 j/ i(欢迎访问avcar:https://avcar.vip)
A. The M+ ion peak has the smallest m/z ratio in the mass spectrum. " B$ b. i# }+ q4 r l0 d4 zB. The m/z ratio of the M+ ion peak gives the relative molecular mass of the molecule.- T. J4 I `: K3 L' P$ M7 d(欢迎访问avcar:https://avcar.vip)
C. The M+ ion is the most stable fragment formed during electron bombardment. , r" M3 ?: p: P$ b1 t' SD. The M+ ion peak has the greatest intensity in the mass spectrum. " g$ ?5 m1 X/ L& f$ r1 ^+ U# Z% Z; ?0 k2 ^- r% h(欢迎访问avcar:https://avcar.vip)
第十题采矿学 g; h4 d9 w2 S4 c( T) u% M2 {(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:______、 ______、 ______、______、和______。