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[单选题]
Which of the following frequency planning methods must use the radio frequency hopping
A.4*3
B.7*3
C.1*3
D.MRP
查看答案
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A.4*3
B.7*3
C.1*3
D.MRP
A.in which
B.in that
C.at which
D.on which
A.who is
B.who are
C.which are
D.which is
A.hepatitis
B.hepatorrhexis
C.hepatoma
D.hepatorrhaphy