單項(xiàng)選擇題The microsecond unit of time is used in radar applications. The microsecond represents which of the following?().

A.one-millionth part of a second
B.one-thousandth part of a second
C.one-hundredth part of a second
D.one-tenth part of a second


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1.單項(xiàng)選擇題The minimum range at which a target can be detected is basically determined by which of the following?().

A.persistence
B.pulse repetition rate
C.pulse length
D.rotation rate

2.單項(xiàng)選擇題The number of pulses of energy transmitted per second is call the().

A.carrier frequency
B.pulse repetition rate
C.pulse length
D.pulse repetition time

5.單項(xiàng)選擇題The transmission time duration of a single pulse of radio-frequency energy is a function of the().

A.persistence
B.pulse repetition rate
C.pulse length
D.resolution