The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.<br>A:one-millionth part of a second<br>B:one-thousandth part of a second<br>C:one-hundredth part of a second<br>D:one-tenth part of a second

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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