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【简答题】
铁路旅客运输的产品总量是________。
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【单选题】同相比例运算放大器电路如图所示,输入u i 为有效电压为1V,R1和RF电阻分别为10KΩ和30KΩ,则输出的有效电压为( )V
A.
1
B.
3
C.
4
D.
5
【单选题】使用SQL命令不能创建的对象是( )。
A.
4
B.
数据表
【单选题】使用SQL命令不能创建的对象是( )。
A.
数据表
B.
窗体
C.
选择查询
D.
操作查询
【单选题】听力原文:W: Are these treatments really necessary? They don't seem to help much. M: I'm afraid so, Mrs. Jones. Just be patient and I'm sure you'll see some results soon. Q: Where did this conversation mos...
A.
In a doctor's office.
B.
In a professor's office.
C.
In a lawyer's office.
D.
In a businessman's office.
【单选题】运算放大器应用电路如图所示,在运算放大器线性工作区,输出电压与输入电压之间的运算关系是( )。
A.
uo=10(u1-u2)
B.
uo=10(u2-u1)
C.
uo=-10u1+11u2
D.
uo=10u1-11u2
【单选题】听力原文:W: I really like these gloves. They look good as a gift for my niece, but I'm afraid they will not fit. M: Don't worry. It says one size fits all. Q: What is this woman worried about? (17)
A.
Her niece will think these gloves are old-fashioned.
B.
Her niece might not like these gloves.
C.
These gloves might not be her niece's size.
D.
These gloves are the wrong colour.
【单选题】如图所示运算放大器电路 , 输入电压 u i =1V , 则输出电压 u O 等于 ( ) 。
A.
1V
B.
正 饱 和 值
C.
负 饱 和 值
【简答题】—I’m sorry I didn’t bring the book here. —Oh, ____. Bring it next time, OK? A.you’d better not B.I’m afraid not C.as you wish D.that’s all right
【简答题】变间隙电容传感器的测量电路为运算放大器电路,如图所示。 C 0 =200 pF ,传感器的起始电容量 C x0 =20pF , 定动极板距离 d 0 = 1.5mm , 运算放大器为理想放大器(即 K →∞, Z i →∞), R f 极大,输入电压 u 1 =5 sinω t V 。 求当电容传感动极板上输入一位移量△ x = 0.15mm 使 d 0 减小时,电路输出电压 u 0 为多少? 变...
【单选题】运算放大器应用电路如图所示,在运算放大器线性工作区,输出电压与输入电压之间的运算关系是()。
A.
u o =10u i
B.
u o =10u i
C.
u o =11u i
D.
u o =5.5u i
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