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【单选题】
三极管处于放大状态的条件是( )A.
集电结和发射结都正偏
B.
集电结和发射结都反偏
C.
集电结反偏，发射结正偏
D.
无法确定
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举一反三
【简答题】我们各付各的吧。
【单选题】A good conclusion _____.
A.
continues to discuss on the topic with presenting more points
B.
alerts listeners that the speech is going to end
C.
ends the speech abruptly
【单选题】A good conclusion _____.
A.
none of the above
B.
alerts listeners that the speech is going to end
C.
ends the speech abruptly
D.
continues to discuss on the topic with presenting more points
【单选题】A good conclusion _____.
A.
continues to discuss on the topic with presenting more points
B.
alerts listeners that the speech is going to end
C.
none of the above
D.
ends the speech abruptly
【单选题】在一次 “老鹰捉小鸡”的游戏中，幼儿由于同情被捉去的小鸡，产生了这样的想象：“鸡爸爸回来了，又把小鸡就回来了”。这是（ ）
A.
想象的主题不稳定
B.
想象的内容零散、无系统
C.
以想象过程为满足
D.
想象受情绪和兴趣的影响
【多选题】A good conclusion usually consists of_________.
A.
a brief summary of main points
B.
a short conclusion if necessary
C.
showing gratitude to the audience for their presence
D.
leading up to a question and answer session
【多选题】A good conclusion of a presentation usually consists of_________.
A.
a brief summary of main points
B.
a short conclusion if necessary
C.
showing gratitude to the audience for their presence
D.
leading up to a question and answer session
【简答题】十字轴式不等速万向节，当主动轴转过一周时，从动轴转过_____________
【多选题】A good conclusion of a presentation usually consists of ____________.
A.
showing gratitude to the audience tor their presence
B.
a brief summary of main points
C.
a short conclusion if necessary
D.
leading up to a question and answer session
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