【判断题】使用PLC编程软件时,按F2打开监控模式,按F3进入写入模式。
【单选题】Why does the man want to write about the ancient civilizations of Mexico?
A.
It would require a trip to Mexico.
B.
It's too broad a topic to research.
C.
He doesn't have relevant resource material.
D.
He's not interested in the part of the world.
【单选题】In order to________a good knowledge of English, he gave up his job and went to Britain. [ ]
【简答题】Experience in advertising would be helpful in this job.
【单选题】Why does the man want to write about the ancient civilizations of Mexico?
A.
It would require a trip to Mexico.
B.
It's too broad a topic to research.
C.
He doesn't have relevant resource material.
D.
He's interested in that part of the world.
【简答题】鞭毛主要化学成分为____________,鞭毛主要功能为____________。荚膜的主要化学成分有____________和____________等,常采用____________方法进行荚膜染色。霉菌的细胞壁化学组成是____________等;酵母菌细胞壁化学成分是____________和____________等。