更多"FREQUENCY:"的相关试题:
[简答题]What is nominal central frequency?
[单项选择]
Because noises modulate radio frequency, radio stations use a band of frequencies to prevent interference with other stations.（）
A. govern
B. adapt
C. temper
D. renovate
[单项选择]In a frequency distribution histogram, the frequency of an interval is given by the:（）
A. width of the corresponding bar.
B. height multiplied by the width of the corresponding bar.
C. height of the corresponding bar.
[判断题]Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
[单项选择]In an FM radio, the Intermediate Frequency is usually ______.
A. 10.7 MHz
B. 455 kHz
C. 540 kHz
D. 1605 kHz
[单项选择]______ popularity of subject matter and frequency of use, the books on the two middle shelves will be the most helpful to you.
A. As of
B. As regards
C. As from
D. As against
[单项选择]What is the OSPF default frequency,in seconds,at which a cisco router sends hello packets on a multiaccess network?（）
A. 10
B. 40
C. 30
D. 20
[单项选择]______popularity of subject matter and frequency of use, the books on the two middle shelves will be the most helpful to you.
A. As of
B. As regards
C. As from
D. As against
[多项选择]RFID的英文全称是Radio Frequency Identification，即射频识别。以下哪些也代表RFID名称？（）
A. 条码
B. IC卡
C. 电子标签
D. 非接触卡
[单项选择]报警信息“输出电源工作频率超差（Output Frequency Error）”出现时，控制电路的反映为（）。
A. （R、L）
B. （E、L）
C. （L、S）
D. （D、S）
[多项选择]In which three frequency bands does the Cisco Spectrum Expert Wi-Fi tool perform spectrumanalysis？ （）
A. ISM 2.4 GHz
B. ISM 900 MHz
C. ISM 5 GHz
D. public safety 4.9 GHz
E. GSM 1.9 GHz
[单项选择]What is the frequency of the front side bus （FSB） on the eX4 architecture？（）
A. 667 MHz
B. 533 MHz
C. 1066 MHz
D. 333 MHz
