The structure, the principle of work, bauxite floatation of BF - L floatation machine were presented.本文介绍了BF -L 型浮选机的结构特点, 工作原理及铝土矿选矿的适应性研究.B factor ( BF ) in thyroid function hyperfunction sickness blood serum content a...
我们大多数航班行李限重为每位乘客44磅。Most of our flights have a baggage allowance of 44lbs per passenger.他力主对安全部队设限。He urged restraint on the security forces.这些文件仍仅限公务员使用.Access to the documents remains restricted to civil servants....
The ancient civilization fellinto oblivion.古代的文明被遗忘了。Two hermits lived in a cave far from civilization.两个隐士连个隐士住在远离村庄的山洞里.People have no letters at the primary stage of civilization.在文明的初期, 人类是没有文字的。Some records of ancie...