单项选择题
（）20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions are possible.
A.As many as
B.So many as
C.As much as
D.As more as
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相关考题
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单项选择题
What will NOT induce errors into a doppler sonar log?（）
A.Increased draft
B.Pitch
C.Roll
D.Change in trim -
单项选择题
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 -
单项选择题
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
