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

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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

單項(xiàng)選擇題

Radar bandwidth is normally（）to the range scale and the associated pulse length.

A.fixed
B.matched
C.fitted
D.equal