Two light sources are said to be coherent if they ( ) A: are of the same frequency. B: are of the same frequency and amplitude. C: are of the same amplitude, and maintain a constant phase difference. D: are of the same frequency, and maintain a constant phase difference.

What does the abbreviation "VHF' stand for? A: Vessel's Hoisting Flag B: Very High Safety C: Very Hot Frequency. D: Very High Frequency

Spot dictation56 Omit _________ _________ on this frequency. [音频]

The difference between a histogram and a frequency polygon is: A: the frequency polygon is reported as a percent, a histogram does not report percents. B: the histogram shows frequencies while a frequency polygon shows cumulative frequencies. C: the bars in a histogram and a frequency polygon cannot be adjacent. D: open-ended classes can be accommodated with a frequency polygon.

For<br/>a bar chart, we take _____ as the horizontal axis. () A: frequency B: relative<br/>frequency C: relative<br/>frequency density D: values<br/>of a variable

Which<br/>of the following is the Y-axis of the histogram?() A: frequency B: relative<br/>frequency C: relative<br/>frequency density D: values<br/>of a variable E: rate

In fact, the word “shall” ranks first among the model verbs which appear in legal English in frequency.

frequency band

Which<br/>of the following can be used as the Y-axis of the bar chart? () A: frequency B: relative<br/>frequency C: relative<br/>frequency density D: values<br/>of a variable

The<br/>vertical axis of the histogram is () A: Frequency B: Relative<br/>frequency C: Relative<br/>frequency density D: The<br/>values of a variable E: The<br/>intervals of a variable