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测量LED可变信息标志的绝缘电阻时，应用精度1.0级的兆欧表在电源接线端子与机壳之间施加（　　）1min后读取测量结果。

A.500V直流电压
B.1000V直流电压
C.1000V交流电压
D.2500V交流电压
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2015年3月5日，李克强总理在政府工作报告中首次将“互联网+”行动计划提升为国家战略。
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It’s that time of the year－graduation. The end of school year is nearly in sight, and it’s an especially big deal if you’re finishing high school or college.
One amazing（令人惊叹的）16-year-old Florida girl, Grace Bush, graduated from both high school and college this week！She actually got her college diploma（毕业证书）before her high school diploma. How’d she do that?
“Hard work and dedication（专心致志）,”she told a local TV news station, “have made me succeed in doing high school and college at the same time.” She started taking college courses when she was just 13. She would often get up at 5:30 a.m. and not finish until after 11 p.m.
Doing both at once is a huge achievement, but it has also helped her family save money. She’s one of the 9 children, all home-schooled until the age of 13．Her father is a math professor while her mother is a part-time history teacher in a high school. Grace Bush has earned her college degree in law, with a near perfect GPA of 3.8 and she hopes to become a lawyer one day, although her parents expect her to teach at university. By the way, she also plays basketball in her college team in her spare time.
Which of the following is the key to Grace’s success?（　　
A.Takingcollegecoursesat13
B.Beingdevotedtoherstudies
C.Beingborninaprofessor’sfamily
D.Doinghighschoolandcollegeatthesametime
单项选择题
依据《交通信息采集微波交通流检测器》（GB/T20609-2006）。检测断面内车流量的检测精度应不低于（　　）。
A.80%
B.83%
C.95%
D.99%
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