According to the meaning of stop signal, it is divided into absolute signal and permissive signal.
According to the meaning of stop signal, it is divided into absolute signal and permissive signal.
2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
The filtered signal will have a time delay compared with the original signal. ( )
The filtered signal will have a time delay compared with the original signal. ( )
The filtered signal will have a time delay compared with the original signal. ( ) A: 正确 B: 错误
The filtered signal will have a time delay compared with the original signal. ( ) A: 正确 B: 错误
The signal transmission portion of the analog video surveillance system is responsible for the upstream transmission of the video signal and the downstream transmission of the control signal. ( ) A: 正确 B: 错误
The signal transmission portion of the analog video surveillance system is responsible for the upstream transmission of the video signal and the downstream transmission of the control signal. ( ) A: 正确 B: 错误
A [tex=2.357x1.0]7qflA3rEKmWSipDA3jV3Ug==[/tex] sinusoidal signal is sampled at [tex=2.857x1.0]sSdkgCWSu/vvQQkWRfK5xw==[/tex] and 128 samples are collected and used to compute the 128-point DFT of the signal. What is the time duration in seconds of the collected samples?
A [tex=2.357x1.0]7qflA3rEKmWSipDA3jV3Ug==[/tex] sinusoidal signal is sampled at [tex=2.857x1.0]sSdkgCWSu/vvQQkWRfK5xw==[/tex] and 128 samples are collected and used to compute the 128-point DFT of the signal. What is the time duration in seconds of the collected samples?
Sampling of an analog signal produces对一个模拟量采样，产生 A: a series of impulses that are proportional to the amplitude of the signal.与信号幅值成正比的一系列脉冲。 B: a series of impulses that are proportional to the frequency of the signal.与信号频率成正比的一系列脉冲。 C: digital codes that represent the analog signal amplitude.表示模拟信号幅值的数字代码。 D: digital codes that represent the time of each sample.表示每次采样时间的数字代码。
Sampling of an analog signal produces对一个模拟量采样，产生 A: a series of impulses that are proportional to the amplitude of the signal.与信号幅值成正比的一系列脉冲。 B: a series of impulses that are proportional to the frequency of the signal.与信号频率成正比的一系列脉冲。 C: digital codes that represent the analog signal amplitude.表示模拟信号幅值的数字代码。 D: digital codes that represent the time of each sample.表示每次采样时间的数字代码。
In an inversion-recovery experiment, at the null point, t0, for a tissue with a short T1 relaxation time, the tissue will:（反转恢复实验中，对于一种T1弛豫时间短的组织的过零点t0，组织会：） A: ) have an observable signal, while long T1 tissue will have no signal.（有可以被观测到的信号，长T1的组织没有信号） B: ) have no observable signal, while long T1 tissue will have signal.（没有可以观测的信号，长T1的组织会有信号） C: ) have a similar signal intensity to long T1 tissue.（和长T1组织有相同的信号）
In an inversion-recovery experiment, at the null point, t0, for a tissue with a short T1 relaxation time, the tissue will:（反转恢复实验中，对于一种T1弛豫时间短的组织的过零点t0，组织会：） A: ) have an observable signal, while long T1 tissue will have no signal.（有可以被观测到的信号，长T1的组织没有信号） B: ) have no observable signal, while long T1 tissue will have signal.（没有可以观测的信号，长T1的组织会有信号） C: ) have a similar signal intensity to long T1 tissue.（和长T1组织有相同的信号）
_____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving
_____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving
what is an analog signal? A: Analog signal is a continous values B: Analog signal is a discrete values C: Analog signal is sometimes continous,sometimes discrete
what is an analog signal? A: Analog signal is a continous values B: Analog signal is a discrete values C: Analog signal is sometimes continous,sometimes discrete