【判断题】景区游览过程中,全陪应走在团队的最后,随时留意旅游者的动向。( )
【简答题】Cells differ widely in form and function but they all have certain characteristics. Firstly, they are bounded by a limiting membrane, the plasma membrane. Secondly, they have the ability to break down...
【多选题】Nucleotides have a variety of important functions in all cells, including:
A.
They are the precursors of DNA and RN
B.
They are essential carriers of chemical energy—a role primarily of ATP and to some extent GTP.
C.
They are components of the cofactors NAD, FAD, Sadenosylmethionine, and coenzyme A, as well as of activated biosynthetic intermediates such as UDP-glucose and CDP-diacylglycerol.
D.
Some, such as cAMP and cGMP, are also cellular second messengers.
【判断题】毕业论文的 摘要一般应说明研究背景、目的、方法、结果、结论等,而重点是研究目的和方法。
【单选题】Es war sehr nett von dir, _ .
A.
mir bei der Arbeit geholfen zu sein
B.
mir bei der Arbeit zu helfen
C.
mir bei der Arbeit geholfen zu haben
【单选题】FX 系列可编程序控制器定时器用( )表示
【简答题】All cells have some similarities including ()、()and ().
【单选题】FX系列可编程序控制器定时器用( )表示。
【简答题】细胞膜是半渗透膜 It’s _____, meaning that 能使某些物质进入或阻隔在胞外 it lets some thing _____ in and out but blocks others. 膜上有许多受体 The cell membrane is _____ with tiny projections. 它们都有功能 如介导细胞间的粘附 They all have _____, ...