Due to GPS roll over of the clock cycle，GPS receivers may give the wrong time and position or may lock up permanently on（）.<br>A:21-Aug-99<br>B:21-Sep-99<br>C:Octoer 31，1999<br>D:31-Dec-99

Due to GPS roll over of the clock cycle，GPS receivers may give the wrong time and position or may lock up permanently on（）.
A:21-Aug-99
B:21-Sep-99
C:Octoer 31，1999
D:31-Dec-99

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