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【简答题】
已知调频信号表达式为u FM (t)=6cos[2π×10 8 t+12sin(2π×200t)]V，k f =2π×10 3 rad/(s·V)。试求：（1）计算载波频率和振幅；（2）求最大相位偏移；（3）最大频偏；（4）调制信号频率及振幅；（5）求有效带宽。
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【单选题】What is the killdeer's nest in parking lot an example of?
A.
A primitive type of nest.
B.
An elevated nest.
C.
A typical cup-shaped nest.
D.
A nest of twigs and branches.
【单选题】Men have traveled ever since they first appeared on the earth. In primitive times they did not travel for pleasure but to find new places where their herds could feed, or to escape from hostile neighb...
A.
for joy
B.
from necessity
C.
to broaden the mind
D.
to escape from the wild animals
【单选题】How did the primitive people pass the accumulated knowledge on to the next generation?
A.
They wrote the knowledge down on papers.
B.
They had the happy 'few' enjoy it.
C.
They taught it to those who have good memories.
D.
They had every one of tile tribe share it and orally passed it on.
【简答题】What did the people in primitive tribes do as they grew up?
【简答题】In primitive times human beings did not travel for pleasure______(而是为了找到较为宜人的气候).
【简答题】看图，回答问题。 1. Did Mike write an e-mail? ___________________________________________ 2. What did they do? ___________________________________________
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