27.目前家禽肺病毒(avian pneumovirus)可分成幾種亞群?
(A)1
(B)3
(C)5
(D)7
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統計: A(166), B(504), C(146), D(133), E(0) #864840
統計: A(166), B(504), C(146), D(133), E(0) #864840