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【多选题】
信号可分为两大类 [ 多选题 ] *A.
模拟信号
B.
数字信号
C.
物理信号
D.
波形信号
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举一反三
【单选题】I don't know if Mr. Wang ______ on a field trip. If he ______on a field trip tomorrow. [ ]
A.
goes; will go
B.
will go; goes
C.
will go; will go
D.
goes; goes
【单选题】What do we learn from the story?
A.
The trip didn't do any good to his health.
B.
The trip was a complete disappointment.
C.
The trip was enjoyable but not fruitful in terms of business.
D.
The trip has helped him meet many interesting people.
【单选题】What do we learn from the story?
A.
The trip didn't do any good to his health.
B.
The trip helped him meet many interesting people.
C.
The trip was enjoyable but not fruitful in terms of business.
D.
The trip was a complete disappointment.
【单选题】What do we learn from the story?
A.
The trip didn't do any good to his health.
B.
The trip was a complete disappointment.
C.
The trip was enjoyable but not fruitful in terms of business.
D.
The trip helped him meet many interesting people.
【单选题】--- The Greens have gone to Yangzhou for a trip, haven’t they ? ---____ , and they will return tomorrow afternoon.
A.
Yes, they have
B.
No, they haven’t
C.
Yes, they haven’t
D.
No, they have
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