That approach will eliminate most cord-cutting concerns—but what about their wireless equivalent, jamming? With the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?Jamming concerns are nothing new, and they're not unique to security systems.

出自-2016年12月阅读原文

Security devices are required to list the frequencies they broadcast on—that means that a potential thief can find what they need to know with minimal Googling.

出自-2016年12月阅读原文

It's easier to find and acquire jamming equipment for some frequencies than it is for others.

出自-2016年12月阅读原文

Burglars can easily get a security device's frequency by Internet search.

出自-2016年12月阅读原文

Any device that's built to receive a wireless signal at a specific frequency can be overwhelmed by a stronger signal coming in on the same frequency.

出自-2016年12月阅读原文

Increasingly, researchers have begun to look at the quality of relationships, rather than at the frequency of contact, between the elderly and their children.

2016年6月四级真题（第一套）阅读 Section A

with the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?

2016年12月四级真题（第一套）阅读 Section B

If we can help to direct students to more of these types of campuses and help students to understand them to be realistic and accessible places, have them apply to these schools at greater frequency and ultimately get in and enroll, we are going to raise the success rate, Rubinoff said, citing a variety of colleges ranging from large state institutions to smaller private schools.

出自-2015年12月阅读原文

For this he and his wife received the Nobel Prize for physics in 1910, and did so again in 1912 for their work on very high frequency radio waves.

出自-2013年12月听力原文

Their work on very high frequency radio waves

出自-2013年12月听力原文

"If we can help to direct students to more of these types of campuses and help students to understand them to be realistic and accessible places, have them apply to these schools at greater frequency and ultimately get in and enroll, we are going to raise

2015年12月六级真题（第三套）阅读 Section B

If we can help to direct students to more of these types of campuses and help students to understand them to be realistic and accessible places, have them apply to these schools at greater frequency and ultimately get in and enroll, we are going to raise

2015年12月六级真题（第三套）阅读 Section B

Though often viewed as a problem for western states, the growing frequency of wildfires is a national concern because of impact on federal tax dollars, says Professor Max Moritz, a specialist in fire ecology and management.

2017年考研真题（英语二）阅读理解 Section Ⅱ