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單項(xiàng)選擇題

Before（）,a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.

A.transmit
B.to transmitting
C.transmitting
D.in transmitting

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單項(xiàng)選擇題

The emergency communication set’s transmitter should not be tested except when（）by a public radio inspector.

A.inspecting
B.inspected
C.inspects
D.having inspected

單項(xiàng)選擇題

Which expression has the different meaning from entry into force ? “entry into force” means is（）.

A.coming into effect
B.moving to full effect
C.being based on force
D.coming into force

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