PN结外加反偏电压时，内电场和外电场方向相同，增强了内电场。扩散电流此时受到阻碍大大减小。
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PN结反偏时，少子的漂移电流小于扩散电流，此时扩散电流可以忽略
A. 对
B. 错
PN结正偏时可看成导通，反偏时近似截止。
A. 对
B. 错
The two types of topic outline form are（ ）.
A. The decimal system.
B. The Roman system.
C. The Greek system.
D. The Arabic system.
Which of the following statementsare are true about outlining? ( )
A. Outlining is a method of classifying and organizing a list of key points.
B. It shows the relationship between the main idea and the supporting details.
C. It is also a skill that will help you summarize the main idea.
D. Simplified forms of outlining should not be used in our listening practice.
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