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【单选题】
RS-232-C是目前常见的一种接口标准，它是由(32)提供制定的。该标准在OSI模型中属于(33)层协议标准，通过RS-232-C来连接两个设备最少要连接(34)条线。这个标准的设计数据速率是处理(35)bit/s。(35)bit/s条件下，采用RS-422标准来代替RS-232-C，连接设备间的距离可扩展到约为原有的(36)倍。A.
CCITT
B.
IFIP
C.
EIA
D.
IEEE
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【简答题】_____, I have never seen anyone who’s as capable as John． A．As long as I have traveled B．Much as I have traveled C．Now that I have traveled so much D．As I have traveled so much
【多选题】下面对光的性质描述正确的是:
A.
光是粒子性的还是波长性的，一直是科学领域无法论证的课题。
B.
光粒子的运动轨迹是呈周期性的波
C.
光是由光粒子组成的
D.
牛顿证明过光具有粒子性
【简答题】Instead of Criticizing Elise for what she had: done, the teacher praised her______ (high).
【单选题】The teacher recommended that Jack______ math or physics instead of English because he was quick at numbers.
A.
must study
B.
could study
C.
study
D.
studied
【单选题】A good teacher should encourage his students to ____ the knowledge by themselves instead of just copying and memorizing what the teacher said in class.
A.
expand
B.
observe
C.
digest
D.
react
【单选题】_____, I have never seen anyone who's as capable as John. [ ]
A.
As long as I have traveled
B.
Now that I have traveled so much
C.
Much as I have traveled
D.
As I have traveled so much
【多选题】有关香豆素荧光性质描述正确的是 （ ）
A.
大多数的香豆素在紫外光的照射下可呈现绿色荧光
B.
大多数的香豆素在紫外光的照射下可呈现蓝色或紫色荧光
C.
在碱性溶液中荧光增强
D.
在碱性溶液中荧光减弱
E.
荧光的强弱和有无，与分子中取代基的种类和位置有关
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