One of the signals，other than a distress signal，that can be used by a vessel to attract attention is a(n)（）.
One of the signals，other than a distress signal，that can be used by a rescue boat to attract attention is a/an（）.
A list man would expect to see any of the following light signals except （）.
What is the lifesaving signal for You are seen -assistance will be given as soon as possible?（）
The lifesaving signal indicating You are seen - assistance will be given as soon as possible is the（）.
The signal for a fire emergency on an OSV is（）.
A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.
When a router converts analog signals to digital signals， what three steps are always included in the process？（）
What approximates the signal attenuation of a plasterboard wall？（）
In the International Code of Signals，the code signal meaning I require immediate assistance is（）.
A tug would NOT assist a ship to steer if the tug is made up to the large vessel（）.
Which spoken emergency signal would you use to call a boat to come assist a man overboard?（）
Which of the following of a component of the Cisco SMB Support Assistant?（）
The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.
A signal indicating zone time is preceded with the letter（）.
if the feedback signal is fed back to the reverting input, it is a ( ) feedback, and if the feedback signal is fed back to the nonreverting input, it is a ( ) feedback
As a personal assistant, Jasmine need to ____ the meetings.
if the feedback signal is fed back to the reverting input, it is a ( ) feedback, and if the feedback signal is fed back to the nonreverting input, it is a ( ) feedback
______is the device that provides amplification(the increase in current, voltage, or power of a signal)without appreciably altering the original signal.
The signal sequence that directs a protein from the cytosol into the nucleus is called nuclear localization signal (NLS).
The Assistant Referee is allowed to over rule the Referee during a game.
听力原文：Man: Some of us can remember the days when a visit to the supermarket was no fun. If you needed information, there was never an assistant in sight. And when you did find one, they knew less than you. Well, that time is long past, and the seminar I watched recently at our award- winning supermarket was a revelation. It endeavoured to keep sa[es assistants up-to-date with information about food technology, how to access product information on the store intranet, and so on. And that's what gave this supermarket its edge.
Questions 18～21 are based on the following dialogue between a customer and a shop assistant.
Chapter 3: A transmitter converts the sensor’s output signal into a signal that can be recognized by the controller.（）
