(单选题)11: I’ll never forget______ my school headmaster for the first time. A: to meet B: meeting C: meet D: met ...

(单选题)1: It _____ them three years to build this road. A: cost B: spent C: took D: paid ...

(单选题)16: Tom ____ his lessons from seven to eight last night. A: had done B: was doing C: were taken D: had been taken ...

(单选题)11: He lost the bag _______ he spent lots of money. A: in which B: on which C: for which D: D. to which ...

(单选题)6: He was born in the year _____ the Anti-Japanese War broke out. A: which B: on which C: during which D: when ...

(单选题)6: 雨天路滑,车辆需减速行驶,是为了( ) A: 减小惯性，刹车时车能很快停止 B: 避免惯性，遇事时车能立即停止 C: 增大惯性，刹车时车能停得更快 D: 防止因惯性来不及停车而造成交通事故 ...

(单选题)6: 三个二甲苯中，需要用特殊精馏加以分离的是（ ）。 A: 邻二甲苯和对二甲苯； B: 邻二甲苯和间二甲苯； C: 间二甲苯和对二甲苯； D: 都可以用普通精馏加以分离。 ...

(单选题)1: 从石油、天然气、煤等天然资源出发，经过化学加工可得到三烯、三苯、乙炔、萘和合成气这九大有机化工基础原料，其中的三烯指（ ）。 A: 乙烯、丙烯和丁烯 B: 乙烯、正丙烯和异丙烯 C: 乙烯、丙烯和丁二烯 D: 乙烯、丙烯和戊烯。 ...

(单选题)6: 在制备合成气的工艺流程中，CO的变换流程有许多种，就压力而言，有高压和低压之分，简称高变的有（ ）种。 A: 二 B: 三 C: 四 D: 五 ...

(单选题)1: 烃类热裂解的原料为：天然气、炼厂气、石脑油、轻油，柴油和重油等，目前我国常用的是（ ）。 A: 天然气和石脑油 B: 天然气和轻柴油 C: 石脑油和轻油 D: 石脑油和轻柴油。 ...