无论是PNP型还是NPN型三极管，若工作在放大状态时其条件是（）。

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问题单项选择题

A．发射结正向偏置，集电结反向偏置

B．发射结集电结都反向偏置

C．发射结集电结都正向偏置

D．视管子类型而定

答案

参考答案：A

判断题

瓦斯的存在不影响煤尘爆炸的条件

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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．programming

B．command

C．markup

D．interactive

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