以单质碘为催化剂合成了环戊酮乙二缩酮.Cyclopentanone ethylene ketal was synthesized with I _ 2 as catalyst.传统的缩酮化、酯化反应工业上多采用浓硫酸作催化剂.Traditional ketalization and esterification reactions are usually catalyzed by concentrated acid in industr...
The basic principle and one - dimensional mathematic model of MagnetoHydrodynamic ( MHD ) controlled inlet were presented.阐述了 磁控 进气道的基本原理,建立了一 维 数学模型.The stability of large - scale magnetohydrodynamic ( MHD ) modes is cr...
I'll sell at a discount in return for a speedy sale.为了尽快售出，我会打折销售。Eagle Star offers a 10% discount to the over-55s.鹰星公司给予年龄在55岁以上的顾客10％的折扣。In 1979, Liquor Barn thrived as a discount merchandiser.1979年，LiquorBarn烈酒折扣...
我们围坐在火边取暖。We sat round the fire to keep ourselves warm.她在人行道上跺着双脚取暖。She stamped her feet on the pavement to keep out the cold.韦德把冰凉的双手放在暖气片上取暖。Wade placed his chilled hands on the radiator and warmed them....
Such cultures could give rise to vascular tissues, roots and shoot buds.这样的培养可能产生维管组织, 根和苗端芽.Many of the cells in such cultures have somewhat sculptured walls.在这样的培养中很多细胞具有多少呈花纹状的细胞壁.Many natural fibers decay rapidly whe...