Patients were dying because of an acute shortage of nurses.因为护理人员严重不足，患者生命垂危。Any shortage could push up grain prices.任何一种短缺都会抬高粮食价格。There is a shortage of council housing.廉租公房房源不足。...
装牛奶的硬纸盒壁常常向外弯曲.The sides of a cardboard carton of milk will often curve outwards.是关闭结束卡车二手的为运输被包装的硬纸盒?Are closed end trucks used for transporting packed cartons?所有的硬纸盒都堆放在地板上.All the cardboard boxes lay piled on the floo...
目的: 合成新的双-胡椒醛缩二胺类席夫碱化合物.Methods: Five Schiff bases were prepared from piperonal and diamines by condensation reaction.用胡椒醛为起始原料,经氯化 、 水解、缩合,制得血凝酸胺.After the process of chlorination, hydrolytic decomposition and condensat...