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【简答题】
反馈是指放大器的输出端把输出信号的 或者全部通过一定方式送回到放大器的 的过程。
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【简答题】如何在EXCEL中实现分类汇总操作?
【单选题】香豆素结构中具有什么特征结构
A.
异戊烯基
B.
双酮结构
C.
内酯结构
D.
苯环
E.
羟基
【单选题】具有苯并咪唑结构特征,可抑制H+/K+-ATP酶,以光学异构体上市的抗溃疡药是
A.
法莫替丁
B.
雷尼替丁
C.
雷贝拉唑
D.
泮托拉唑
E.
埃索美拉唑
【单选题】How did the man feel after his first marathon?
A.
He was proud of his performance.
B.
He was disappointed in himself.
C.
He knew marathons would be part of his life.
D.
He believed he would never do it again.
【单选题】How did the man feel about the police officer's final decision?
A.
Happy.
B.
Sad.
C.
Angry.
【单选题】具有苯并咪唑结构特征可抑制H+一K+ATP酶,以光学活性异构体上市的抗溃疡药是
A.
法莫替丁
B.
盐酸雷尼替丁
C.
雷贝拉唑钠
D.
泮托拉唑
E.
埃索美拉唑
【单选题】Question: How did the man feel about the interview?
A.
He is sick.
B.
He is worried.
C.
He is confident.
D.
He is angry.
【判断题】Excel中“撤销”操作只能撤销最近一次操作。 ( )
A.
正确
B.
错误
【判断题】在Excel中,链接和嵌入的主要不同就是数据存储的地方不同。(    )
A.
正确
B.
错误
【单选题】How did the man feel about the woman's apology?
A.
Amusing.
B.
Annoying.
C.
Desirable.
D.
Reasonable.
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