He took my English-Chinese dictionary _____ mistake. [ ]
A. to
B. by
C. about
D. on
答案:B
精馏塔进行全回流操作时,达到给定分离程度所需的理论塔板数()。
A、最多
B、最合适
C、最少
D、无法确定
简述出版物目录,订单的设计和编写要求。