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【单选题】
在信息传输速率相同的条件下,多模光纤的传输距离要比纤小 得多,主要原因是什么?A.
多模光纤比光纤便宜一些
B.
多模光纤中的模间色散现象会引起所传输的光信号产生畸变，且传输距离 越大，畸变程度越严重
C.
传输距离越大，多模光纤中的光信号的衰减越严重
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【单选题】For a good that is taxed, the area on the relevant supply-and-demand graph that represents government’s tax revenue is a
A.
triangle.
B.
rectangle.
C.
trapezoid (梯形).
D.
None of the above is correct; government’s tax revenue is the area between the supply and demand curves, above the horizontal axis, and below the effective price to buyers.
【简答题】The prisoner was ________ of his civil liberty for three years. A) discharged B) derived C) deprived D) dispatched
【简答题】科学思维就是( ),是现代新思维的主要特征。
【简答题】法律关系包括三个要素，即法律关系的（）、法律关系的（）和法律关系的（）。
【单选题】For a good that is taxed, the area on the relevant supply-and-demand graph that represents government’s tax revenue is
A.
smaller than the area that represents the loss of consumer surplus and producer surplus caused by the tax.
B.
bounded by the supply curve, the demand curve, the effective price paid by buyers, and the effective price received by sellers.
C.
a right triangle.
D.
a triangle, but not necessarily a right triangle.
【单选题】For a good that is taxed, the area on the relevant supply-and-demand graph that represents government’s tax revenue is a
A.
a. triangle.
B.
b. rectangle.
C.
c. trapezoid.
D.
d. None of the above is correct; government’s tax revenue is the area between the supply and demand curves, above the horizontal axis, and below the effective price to buyers.
【多选题】关于跨境电子商务，说法恰当的选项（ ）。
A.
（A）跨境电子商务是基于网络发展起来的
B.
（B）网络是一个没有边界的媒介体，具有全球性的特征
C.
（C）对于网络而言，传输的速度基本上与地理距离无关
D.
（D）电子商务主要采取无纸化操作的方式
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