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【简答题】
GPS信号传播要经过大气中的电离层、对流层，他们对电磁波的影响特点有哪些？GPS选用L波段的电磁波作为载波的原因是什么？
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反馈参考答案：
举一反三
【单选题】Questions 2 is based on the news report you have just heard.
A.
Their drivers would feel safe after getting used to the automatic devices.
B.
They would be unpopular with drivers who only trust their own skills.
C.
Their increased comfort levels have boosted their sales.
D.
They are not actually as safe as automakers advertise.
【单选题】Questions 2 is based on the news report you have just heard.
A.
It became a great attraction for tourists.
B.
It was sent to the animal control department.
C.
It was shot to death by a police officer.
D.
It found its way back to the park’s zoo.
【单选题】Questions 2 is based on the news report you have just heard.
A.
Many countries have not taken measures to create enough jobs.
B.
Few countries know how to address the current economic crisis.
C.
Few countries have realized the seriousness of the current crisis.
D.
Many countries need support to improve their people's livelihood.
【单选题】Questions 2 is based on the news report you have just heard.
A.
By taking pictures for passers-by.
B.
By selling lemonade and pictures.
C.
By working part time at a hospital.
D.
By asking for help on social media.
【单选题】Questions 2 is based on the news report you have just heard.
A.
It is stable.
B.
It is durable.
C.
It is inexpensive.
D.
It is sophisticated.
【单选题】Questions 2 is based on the news report you have just heard.
A.
It is not easy to improve one's sleep habits.
B.
It is not good for students to play video games.
C.
Students who are better prepared generally get higher scores in examinations.
D.
Making last-minute preparations for tests may be less effective than sleeping.
【单选题】Questions 2 is based on the news report you have just heard.
A.
He doubled the reward.
B.
He cheered him on all the way.
C.
He set him an example.
D.
He had the event covered on TV.
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