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【判断题】
若将频率特性表示为复平面上的，则的长度为频率特性的幅值，与实轴正方向的夹角为频率特性相位。A.
正确
B.
错误
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举一反三
【单选题】With economy getting worse，we have reached the point________we have to cut down our daily expenses.
A.
that
B.
which
C.
when
D.
where
【单选题】“千里之堤溃于蚁穴”这句话说明: ( )
A.
即使再小的偏差也要控制；
B.
对于会造成巨大损失的工作必须进行前馈控制；
C.
说明控制必须要加强衡量频度；
D.
对工作要全面控制；
【简答题】Translation: The more we control our own fate, the more we expect to control it. The more we have, the more we want to have!
【简答题】下列图片中楼梯类型是()
【简答题】下列图片中楼梯类型是()
【单选题】We have to study the operation manual carefully. 02010511
A.
We have learned the operation introductions by heart.
B.
We have to keep the operation introductions in mind.
C.
We have to read the operation introductions carefully.
D.
We have to refer to the operation introductions carefully.
【单选题】We have to subject the redesigned car seat to the test to officially confirm that it is_______strong.
A.
sufficient
B.
sufficiently
C.
more sufficient
D.
most sufficient
【单选题】听力原文：M: Susan, just check the map and see how far we have to 20 before we get to the town. W: I think we'll have to go another twenty miles. Our speed is now 40 miles per hour, so we'll get there pret...
A.
In about 40 minutes.
B.
In about 30 minutes.
C.
In about 20 minutes.
D.
In about 10 minutes.
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