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【单选题】
根据如下原理图搭建电路，已知输入信号Vi是偏置为0V，峰峰值为4V的正弦信号，频率100Hz。工作在±10V电源下。其他具体的电阻值已经给出，如图所示。【图片】若Vo2和Vo1波形如下图所示，请分析是以下哪种原因导致的？【图片】A.
D1断路
B.
D1短路
C.
D2短路
D.
D2断路
E.
D1短路且D2断路
F.
Rf1实接阻值为1K欧姆
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皮皮学刷刷变学霸
举一反三
【简答题】questions 12 to 15 are based on the second conversation
【单选题】关于雄激素的描述,下列不正确的是( )
A.
不是维持女性生殖功能的激素
B.
肾上腺皮质是产生女性雄激素主要来源
C.
是合成雌激素的前体
D.
在青春期发育中有一定的影响
E.
在维持女性阴毛.腋毛中起一定的作用
【单选题】Questions 12 to 15 are based on the following conversation. 12.
A.
In a restaurant.
B.
In a hotel lobby
C.
At the man’s office.
D.
At the woman’s place.
【单选题】The manager gave her his ________ that her complaint would be investigated.
A.
assurance
B.
assumption
C.
sanction
D.
insurance
【简答题】在同一局比赛中替补队员有 _____次上场机会。 (A)1 (B)2 (C)3 (D)4
【单选题】Questions 12 to 15 are based on the following conversation. 12.
A.
They can predict wars.
B.
They can predict revolutions.
C.
They can predict where you’ll be living in the future.
D.
They can predict disruptions in society.
【单选题】Questions 12 to 15 are based on the conversation you have just heard 12
A.
A sense of freedom driving gives
B.
Rules and regulations for driving
C.
The role policemen play in traffic safety
D.
The impact of engine design on rode safety
【单选题】Questions 12 to 15 are based on the following conversation. 15.
A.
Geography and tone.
B.
Language and tone.
C.
Geography and style.
D.
Terminology and style.
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