题目内容

Heat-labile toxin of ETEC acts by which of the following mechanisms?

Attachment
B. Activation of adenylyl cyclase
C. Aggregative adherence
D. Ribosomal dysfunction

查看答案

搜索结果不匹配？点我反馈

更多问题

Long-term carriage and shedding is most likely to occur after gastrointestinal infection with which of the following species?

A. Escherichia coli O157:H7
B. Shigella dysenteriae
C. Vibrio cholerae
D. Salmonella typhi

11.液压传动的系统中常用的方向控制阀是()。

A. 节流阀
B. 溢流阀
C. 顺序阀
D. 换向阀

9.溢流阀一般是安装在( )的出口处,起稳压、安全等作用。

A. 液压缸
B. 液压泵
C. 换向阀
D. 油箱

10.顺序阀在液压系统中起( )作用。

A. 稳压
B. 减压
C. 压力开关
D. 安全阀