题目：
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
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
