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【简答题】
在接地故障点附近行走时，两脚之间所出现的电位差称为 电压。
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举一反三
【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
【简答题】Instead of Criticizing Elise for what she had: done, the teacher praised her______ (high).
【单选题】___________, I have never seen anyone who’s as wise as John.
A.
As long as I have traveled
B.
Now that I have traveled so much
C.
.As I have traveled so much
D.
Much as I have traveled
【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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