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【判断题】
发球球稳、击球准、发力适当。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【多选题】For the following signals, (i) determine analytically which are periodic (if periodic, give the period) and (ii) sketch the signals. (Scale your time axis so that a sufficient amount of the signal is...
A.
x(t) = 4 cos(5 π t)
B.
x(t) = 4 cos(5 π t- π /4)
C.
x(t) = 4u(t) + 2sin(3t)
D.
x(t) = u(t) - 1/2
E.
x[n] = 4 cos( π n )
F.
x[n] = 4cos( π n-2)
G.
x[n] = 2sin(3n )
【简答题】Match each word or phrase to the correct definition. Not all answers will be used. b a l a n c e d u r i ng r e a l i z e su r p r i se d e p e ndon m e a su r e s c h e d u l e sp e nd ti m e ______ ...
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