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【简答题】
三极管的放大条件为发射结正向偏置， A. 集电结反向偏置
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【简答题】光与物质相互作用时，会被介质吸收或放大。被吸收时，光强会减弱，放大时说明介质对入射光有增益。请问增益系数是与原子相关的哪个物理量成正比？这个物理量在激光的产生过程中扮演什么角色？
【简答题】若[X]补=1000,则X= () 。
【单选题】Which of the following is a disadvantage of the strategy employed in the experimental scholarly methods course?
A.
Students were not given an opportunity to study women writers outside the canon.
B.
Students had little background knowledge for further research.
C.
Most of the students in the course had had little opportunity to study 18th century literature.
D.
Students were not given an opportunity to encounter certain sources of information that could prove useful in their future studies.
【简答题】若[x]补=1000,则x=( )。
【简答题】若[x]补＞[y]补，是否有x＞y?
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