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四. Complete each sentence with the correct form of the word in brackets 1. Asking me ___________ (compare) Shakespeare and Darwin makes no sense; it’s like___________  (compare) apples and oranges. They are totally different. 2. The disc, digitally _________ (record) in a studio,  sounded fantastic at the party that night. 3. Sarah, hurry up . I’m afraid you won’t have time to get _______ (change) before the party. 4. It shames me to say it ,but I told a lie when __________ (question) at the meeting by my boss. 5. ________________ (separate) from other continents for millions of years , Australia has many plants and animals not found in any other country in the world. 6. ______(lose) in the mountains for a week , the two students were finally saved by the local police. 7. _______________(cause) a lot of damage to this area, the storm finally moved out to sea. 8. ______ (put) into use in April2000,the hotline was meant for residents reporting water and heating supply breakdowns. 9. All the things ___________ (consider), his proposal is of greater value than yours. 10. He had his leg _________ (break) in the match yesterday.
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【单选题】采样系统在z平面稳定的充要条件为:( )。
A.
所有闭环极点分布在z平面的单位圆圆周上
B.
所有闭环极点分布在z平面的单位圆内部
C.
所有闭环极点分布在z平面的单位圆外部
D.
所有闭环极点分布在z平面的左半平面
【单选题】判断周期序列的周期:
A.
32
B.
8
C.
16
D.
无周期
【简答题】设周期序列 的周期分别为N和M,求 的周期。
【单选题】工作时以传递扭矩为主,不承受弯矩或弯矩很小的轴,称为 ( )
A.
心轴
B.
转轴
C.
传动轴
D.
曲轴
【简答题】设周期序列 的周期分别为N和M,已知它们的离散傅里叶级数的系数分别为 ,求 的离散傅里叶级数的系数 。
【简答题】判断下面序列是否为周期序列,如果是周期序列,求出它的周期。
【简答题】将以上序列以4为周期进行周期延拓,形成周期序列 ,试写出周期序列 的DFS表达式。
【单选题】工作时以传递扭矩为主,不承受弯矩或弯矩很小的轴,称为( )。
A.
心轴
B.
转轴
C.
传动轴
D.
弯曲轴
【单选题】工作时以传递扭矩为主,不承受弯矩或弯矩很小的轴,称为
A.
心轴
B.
传动轴
C.
转轴
【单选题】工作时以传递扭矩为主,不承受弯矩或弯矩很小的轴,称为( ) 答案
A.
心轴
B.
转轴
C.
传动轴
D.
曲轴
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