When the transmissions of a radio station have broken down, switched off or suspended, it
Is______(1.0)
A.unfunctional B.break down C.off power D.off air正确答案D
When the transmissions of a radio station have broken down, switched off or suspended, it
Is______(1.0)
A.unfunctional B.break down C.off power D.off air正确答案D