Suppose the DTFT ofis. The DTFT ofis ()
A、
B、
C、
D、
第1题
The DTFT of x(n) is X(),then the DTFT of x() is ( ).
A、
B、
C、
D、
第2题
The DTFT ofisand ifid real and even,must be ________.
A、real
B、complex
C、even
D、odd
第3题
Suppose the support of random variableis, and the support of random variableis. If. Thenandare independent.
第4题
Suppose the support of random variableis, and the support of random variableis. If. Thenandare independent.
第6题
Suppose the joint pdf of random variablesandis. The support is, so we can conclude thatandare independent.
第7题
Suppose the joint pdf of random variablesandis. The support is, so we can conclude thatandare independent.
第8题
Suppose the typical cross sectionis 200 mb for strong interaction reactions, like in the reaction. Please estimate the order of magnitude of the cross section of the reaction:which is dictated by the weak interaction. The incoming and outgoing energies are assumed to be same as those in the strong interaction case.
第9题
A.more than $40, as the average benefit will exceed the marginal cost.
B.more than $40, as the marginal benefit will exceed the marginal cost.
C.more than $80, as the average benefit will exceed the marginal cost.
D.more than $80, as the marginal benefit will exceed the marginal cost.
第10题
The TF of one system is:The initial value of the output is,, and the input. Try to evaluate the output c(t)=?
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