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【多选题】
下面描述频率特性概念正确的是( )。A.
在正弦信号输入下,线性定常系统或环节,其输出的幅值与输入幅值之比,称为系统或环节的幅频特性。
B.
在正弦信号输入下,线性定常系统或环节,其输出的相位与输入相位之差,称为系统或环节的相频特性。
C.
在正弦信号输入下,线性定常系统或环节,其稳态输出的幅值与输入幅值之比,称为系统或环节的幅频特性。
D.
在正弦信号输入下,线性定常系统或环节,其稳态输出的相位与输入相位之差,称为系统或环节的相频特性。
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【单选题】如图所示,一物块重为 G ,置于粗糙斜面上,物块上作用一力 F = G 。已知斜面与物块间的摩擦角为 φ m = 25 °。物体能平衡的情况是 。
A.
a
B.
b
C.
c
【单选题】＿＿＿＿＿is just like him to want to do something different from everybody else.
A.
It
B.
There
C.
He
D.
Who
【简答题】I Was Hoping I Could Just Talk to Him. Watch the following dialogue,paying attention to the underlined parts,and then role-play it with your partner. Driver: Excuse me, officers. 1 was wondering if yo...
【单选题】If a person buys a video game system, it is logical to think he needs a game. Offer a specific game to him instead of just asking him if he needs anything else to go with his system. What’s the sellin...
A.
Discounting.
B.
Up-selling.
C.
Buying one, and getting one free.
D.
All goods, half price.
【单选题】If a person buys a video game system, it is logical to think he needs a game. Offer a specific game to him instead of just asking him if he needs anything else to go with his system This is a way of__...
A.
shopping
B.
deliver
C.
reservation
D.
up-selling
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