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【单选题】
________3___________ It means you won't be available for work or other activities . What can you do to make your staycation fun? 1 ) Go to a nearby town, or to a fancy hotel in your hometown and stay over night . Treat yourself to room service and any other fun things the hotel has to offer .A.
Eat out for every meal!
B.
Go on a day trip to a nearby town, or to a beach ．
C.
But why not remain at home and enjoy a staycation?
D.
If you are on a staycation, you might get calls from work ．
E.
Most of the time it involves dining out more frequently than usual ．
F.
Make sure you all have fun, and when it is over, you feel refreshed ．
G.
The trick is to make sure your friends and coworkers know you are on a staycation ．
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【单选题】信号经时移后,其频谱函数的变化为 ( )
A.
幅度频谱和相位频谱均不变
B.
幅度频谱不变，相位频谱变化
C.
幅度频谱变化，相位频谱不变
D.
幅度频谱和相位频谱均变化
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