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问题 选择题

如图所示，电场中有A、B两点，它们的场强分别为EA、EB，则以下判断正确的是（　　）

A．EA=EB

B．EA＞EB

C．EA、EB的方向相同

D．EA、EB的方向不同

答案

由图可知，B点的电场线密，所以B点的电场强度比A高．由电场线上某点的切线方向表示电场强度在该点的方向，可得EA、EB的方向不同．

故选：D

单项选择题

SOX is an alternative (156) for XML. It is useful for reading and creating XML content in a (157) editor. It is then easily transformed into proper XML. SOX was created because developers can spend a great deal of time with raw XML. For many of us, the popular XML (158) have not reached a point where their tree views, tables and forms can completely substitute for the underlying (159) language. This is not surprising when one considers that developers still use a text view, albeit enhanced, for editing other languages such as Java. SOX uses (160) to represent the structure of an XML document, which eliminates the need for closing tags and a number of quoting devices. The result is surprisingly clear.

A．indenting

B．structure

C．framework

D．bracket
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单项选择题

（）能冲淡红脸。

A.紫色

B.绿色

C.红色

D.棕色
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