晶体管的高频参数中，有截止频率、特征频率和最高振荡频率，这三者的大小关系，（）最大，（）次之，（）最小
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According to the video, portaging is:
A. a track or route
B. carrying your canoe
C. a person who carries bags at the airport
D. the age when you can port
According to the video, a fire is important for:
A. scaring away animals
B. signaling help
C. warmth and cooking
D. to show your skill
The bird in the video was called __________.
A. a duck
B. a goose
C. a water fowl
D. a loon
In the wilderness, there are few wild animals.
A. 对
B. 错
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