But when the dominant seller of e-books removes pre-order buttons and makes delivery times longer for Hachette books, that hardly squares with Mr Bezos's professed emphasis on customer service.
不过作为电子书主导销售平台的亚马逊移除阿歇特书籍的预定按钮、延长其送货时间的做法实在有悖于贝佐斯声称的对顾客服务的重视。
Emphasis is made to the methods used in the improvement of sensitivity of Tl, including matrix modification, sampling modes and pre-conc e ntration techniques.
重点介绍了用原子吸收法测定铊时，基体改进剂、进样方式、反应机理以及预富集技术对提高方法灵敏度的作用。
应用推荐