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【判断题】
在域名www .pku .edu.e错中,c错表示中国。A.
正确
B.
错误
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举一反三
【简答题】有平行反应在平推流反应器中进行 A→P 目的产物 r P = k 1 c A A→S 副产物 r S = k 2 c A 2 其中 k 1 =1h -1 , k 2 =1.5m 3. kmol -1. h -1 , c A0 =5kmol.m -3 , c p0 =c s0 =0 ,体积流率为 5m 3. h -1 ,求转化率为 90% 时出口目的产物的浓度 c p 。
【简答题】是最准确、最有效、最强大的需求分析技术。
【单选题】The aviation communication system consists of airborne communication system on the plane and communication system on the ground, which can be used for , , and plane-to-plane communication.
A.
captain to F/O, F/O to Captain
B.
Pilots to ATC, ATC to Pilots
C.
air-to-ground, air-to-air
D.
Flight to Airline, Airline to Flight
【单选题】In a data communication system, the transport media with the widest frequency band and best reliability is the( ).
A.
radio channel
B.
coaxial cable
C.
twisted--pair cable
D.
fiber optic cable
【简答题】有一分解反应在平推流反应器中进行, A → P , r 1 = k 1 c A ; A → R , r 2 = k 2 c A 2 。 k 1 = 1 h -1 , k 2 = 1.5 m 3 .kmol -1 .h -1 ,进料中只有 A , c A0 = 5 kmol.m -3 ,转化率为 90% 时,产物 P 的浓度 为 kmol.m -3 。
【简答题】The aviation communication system consists of airborne communication system on the plane and communication system on the ground, which can be used for , , and plane-to-plane communication.
【单选题】Beijing is a pleasant place with convenient transportation and communication system.
A.
shocking
B.
pleasing
C.
boring
D.
surprising
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