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【判断题】
同一信号,通过不同的线性时不变系统,所得到的输出必然不同。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】— ____________? — Since I was five years old.
A.
How often do you skate?
B.
When did you begin to play baseball?
C.
How long have you been studying French
【单选题】— Could you play the guitar when you were 8 years old? — _____. [ ]
A.
Yes, I could.
B.
No, I can't.
C.
Yes, I can.
D.
No, I won't.
【简答题】瑞霞即将走向工作岗位,她选了一件格子呢西装,但又担心会显得成熟和老气,其实西装隐藏许多小心机。
【单选题】- did you start to swim? -When I was 7 yeas old. [ ]
A.
What
B.
How soon
C.
How long
D.
When
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