【单选题】Mary is a secretary. She usually works _________ the Internet.
【单选题】Mary is a secretary. She often (answers calls) in the office.
【简答题】某种四肽α-COOHpK=2.4,α-N + H 3 pK=9.8,侧链-N + H 3 pK=10.6,侧链-COOHpK=4.2,试计算此种多肽的等电点(pI)是多少?
【单选题】关于渗出液的描述, 下列哪一项是错误的?
【简答题】Mary wants to be a secretary. She is applying for a job as a secretary.
【单选题】Mary is a secretary. She usually works ( ) the internet
【判断题】自动变速器的强制降挡开关一般装在油门踏板下方