BBC is the largest broadcasting corporation (公司) in the world. It enriches (丰富) people s life with all kinds of programmes. It is a public service broadcaster. It serves (服务) 8 national TV channels (频道) , 10 ...
magnetic compass) suspended from a string, and positioned within a coil of wire. Current through the wire coil will produce a magnetic field which will deflect the needle from pointing in the direction of earth’s magnetic field. An antique string galvanometer is shown in the following ...
Typical absorption RF / microwave power meter that uses an external sensor When selecting an RF power meter or a microwave power meter, it is important to select the correct type of power sensor. There are a number of different types of power sensor, and these are suited to different ty...
The radio-frequency (RF)voltage sourceis applied to the center between the two sections of the dipole antenna. Thisvoltageand acurrentflowing through the two conductive elements produce a radio signal or an electromagnetic wave to be radiated outwards from the antenna. The current is maximum and ...
storms. Apart from the fact that this might not even alter the storm, this approach neglects the problem that the released radioactive fallout would fairly quickly move with the tradewinds to affect land areas and cause devastating environmental problems. Needless to say, this is not a good ...
It is important to understand that the spectrum analyzer is not a power meter, even though it can be used to display power directly. As long as we know some value of a sine wave (for example, peak or average) and know the resistance across which we measure this value, we can ...
BEIJING, March 9 (Xinhua) -- From the Yutu-2 lunar rover roaming on the "dark side" of the moon to the Fendouzhe submersible exploring the 10,000-meter deep ocean, and from salt-tolerant rice growing in tidal flats near the sea to Chinese unmanned equipment guided by the Beidou Navigat...
1.D[由“What is5G?”可知,5G是什么。所以小题1 要说明5G的概念。故D选项5G是“第五代移动网 络”的缩写”切题。故选D项。] 2.A [由“5G will use new higher radio frequencies to send out data, which are less cluttered(挤了)and carry information much faster.”可知,5G将使用新的更高 的...
1. To assume control, management, or responsibility: I'm taking over while the supervisor is on vacation. 2. To assume the control or management of or the responsibility for: She took over the job after he left. 3. To become dominant: Our defense took over in the second half of the ...
Along with its various advantages, a PAN also has several shortfalls, such as the following: Short network range and slow data transfer.A PAN uses Bluetooth communication that doesn't span beyond the 10-meter range. This makes long-distance data sharing difficult and slows down the rate of ...