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【简答题】
模拟信号是指随时间_____变化的物理量;数字信号是指随时间_____变化的物理量。
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【单选题】What has the man been doing recently?
A.
He has been working.
B.
He has been studying.
C.
He has been on a camping trip.
【简答题】What has Spirit found that has been exposed to water?
【单选题】What change has been made in the marketing arrangement?
A.
A new consultancy has been contracted.
B.
A new director has been appointed.
C.
The present department has been expanded.
【简答题】Most of what has been said about the Simiths also true of the Johnsons A ． are B ． is C ． being D ． to be
【单选题】According to statistics, _________ of the total area of Alaska has been used for farming.
A.
as fish does
B.
because of its rich natural resources
C.
by the United States in the 19th century
D.
shines day and night
E.
only a very small percentage
F.
a limited amount of the gold found there.
【单选题】What news has just been received?
A.
A stalled truck has been removed.
B.
There is going to be weak fog.
C.
Construction work is beginning in an area.
D.
A route is now open for drivers.
【简答题】如何确定QTL的存在?QTL与数量性状基因有何区别。
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