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【多选题】
以下关于晶体管电流放大作用的条件描述正确的是。A.
发射区很小，但掺杂浓度高。
B.
基区很薄，且浓度最小。
C.
集电极面积最大，浓度介于发射区之间。
D.
外加电源要求对发射结处于正向偏执。
E.
外加电源要求对集电极处于反向偏置。
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【简答题】医学文献检索课前预习,请简要回答1、2、3题并练习第4题 1、列举你最熟悉的检索工具,两到三种。 2、你在检索文献时感到最困难的是什么? 3、描述一下你印象最深的一次检索经历,包括检索目的、过程、问题、结果 4、接触以下检索工具,熟悉基本功能和界面 中国知网、维普期刊、万方医学网
【单选题】2 U6_3_1_2.mp3:
A.
He has fun doing assembling work.
B.
He bakes bread for a big family.
C.
He will work in an office soon.
D.
He works to support his family.
【单选题】B2-U6_3_1_3.mp3: ( )
A.
She has no ideal about her future plan.
B.
She thinks her fatheroffered too many suggestionsabout her future.
C.
She has too many dreams about her future.
D.
She has too little imagination about her job.
【单选题】B1-U6_3_1_2.mp3: ( )
A.
She is watching her diet.
B.
She is not eating healthily
C.
She is losing some weight
D.
She is not doing any exercise
【单选题】B2-U6_3_1_2.mp3: ( )
A.
He has fun doing assembling work.
B.
He bakes bread for a big family.
C.
He will work in an office soon.
D.
He works to support his family.
【单选题】B2-U6_3_1_1.mp3: ( )
A.
He no longer workes in a supermarket
B.
He changes jobs quite frequently.
C.
He quit his job three weeks ago.
D.
He is selling beer in a store.
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