【简答题】v. cut or break small pieces off sth. with a tool 切下,削下,凿下 (碎片、屑片)n. [C] a small piece of silicon that marked with electronic connections that is used in computers and other machines 集成电路片;芯片
【单选题】A(n) _____ is a small piece of software that acts on your behalf (on behalf of another piece of software) performing tasks assigned to it.
A.
agent-based technology
【简答题】大气中的硫和氮的氧化物有____和____两个来源。二氧化硫的自然来源包括____和____,含盐的海水飞沫也增加大气中的硫。
【单选题】A(n) _ is a very small piece of matter with a negative electrical charge, found in all atoms.
【单选题】Even in small colleges, computers are a(n) ___ piece of equipment.
【多选题】养殖水环境中氧气的可能来源包括( )
A.
生物供氧:产氧光合生物(藻草)在光照下经光合作用产氧。
B.
物理供氧:把空气或氧气,经水气混合,溶入水。
C.
化学供氧:水中投入化学物质,发生化学反应释放出氧。
【简答题】FILL IN THE GAP WITH WORDS OR PHRASES GIVEN IN BOX. 只写单词前面的大写字母。 A . universal B. wander C. by a small margin D . without so much as E. barrier F. threaten G. feature H. civilize I. close up J. chart ...