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【多选题】
产品整体概念包含的几个层次是()A.
核心产品
B.
有形产品
C.
附加产品
D.
无形产品
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反馈参考答案：
举一反三
【单选题】While I was still a boy, I came ______ the conclusion that there were three grades of thinking.
A.
of
B.
at
C.
to
D.
on
【单选题】D I was in line waiting to pay. In line there were two people before me. A little boy was buying some rather strange clothes. He chatted with anyone who was interested in the clothes and soon we learn...
A.
Love and goodness.
B.
Culture and tradition.
C.
Friendship and honesty.
D.
Communication and understanding.
【简答题】4如果与门的两个输入端中,A是信号输入端,B为控制端。设输入A的信号波形如图所示,在控制端B=1和B=0两种状态下,试画出输出波形,如果是与非门、或门、或非门,则又如何?分别画出输出波形,最后总结上述四种门电路的控制作用。
【单选题】19 电路如图 6.4.3(a) 所示,其输入、输出电压如图 6.4.4 所示,则该电路产生了 失真,为了减小这种失真,可以采取的措施为 。 图 6.4.3 题 6.4.19 电路图 图 6.4.4 题 6.4.19 输入 / 输出波形图
A.
截止
B.
饱和
C.
截止
D.
饱和
【单选题】共集电极放大电路的输入、输出电压波形如题4图所示，为了消除失真，应采取的措施是( )。
A.
减小R E 的限值
B.
增加R L 的阻值
C.
增大u i 的幅值
D.
增加R B 的阻值
【简答题】完形填空。 If I Were a Boy Again If I were a boy again.I would practice perseverance(毅力)more often,and never give up a thing.If we want__1__,we must conquer(征服)darkness.Perseverance can sometimes __2__geni...
【单选题】If I were a boy again, I would _______ courage.
A.
cultivate
B.
control
C.
conceal
D.
curb
相关题目：
【单选题】共集电极放大电路的输入、输出电压波形如题4图所示，为了消除失真，应采取的措施是( )。
A.
减小R E 的限值
B.
增加R L 的阻值
C.
增大u i 的幅值
D.
增加R B 的阻值
参考解析：
知识点：
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