answer:Sonar The acronym "sound navigation and ranging" stands for Sonar. Sonar is a technique that employs the use of sound waves to detect, locate, and determine the distance and direction of underwater objects, such as submarines, underwater geological formations, wrecks, or other submerged structures. This technology is widely used in various fields, such as oceanography, marine science, defense, and underwater exploration. Sonar can be classified into two main types: passive and active. Passive sonar involves listening to the sounds produced by underwater objects. The sounds are usually emitted naturally or as a result of the object's movement through the water. Active sonar, on the other hand, involves the emission of sound waves by specialized devices and then listening for the echoes produced when these sound waves bounce off of or are reflected by underwater objects. Both passive and active sonars can further be classified based on their frequencies and configurations, such as side-scan sonar, multibeam sonar, and synthetic aperture sonar. Each type of sonar has its specific advantages and intended applications. Now let's briefly explain the provided choices: - Sound transmission: This term refers to the general process of transmitting sound waves through a medium, such as air or water. While it is related to sonar as sound transmission occurs during the sonar process, it is not the correct term for the abbreviation sound navigation and ranging. - GPS: GPS, or Global Positioning System, is a satellite-based global navigation system that provides precise navigation and timing information to users on Earth. While GPS is used for locating objects, it does not function effectively underwater and is unrelated to sound navigation and ranging. - Radar: Radar, or radio detection and ranging, is a technology that uses radio waves to detect, locate, and track objects, such as aircraft, ships, and weather formations. Radar is primarily used above water and for objects in the atmosphere, not underwater, so it is not the appropriate term for sound navigation and ranging. In conclusion, the correct option is Sonar, which is used to locate underwater objects, such as submarines, using sound navigation and ranging techniques.

answer:Step 1: Identify the main subject and the relevant information about the subject. - The main subject is Ricky Lee Muir, a former Australian politician. - He was elected as a Senator for Victoria in the 2013 election, representing the Australian Motoring Enthusiast Party (AMEP). - His term began on 1 July 2014. - Muir failed to retain his seat at the 2016 election following a double dissolution which cut short his term in office. Step 2: Analyze the information to answer the question. - The question asks us whether Ricky Lee Muir won multiple elections. - The information provided states that Muir was elected in the 2013 election. Then, it also states that he failed to retain his seat in the 2016 election. Step 3: Conclude based on analysis. - Based on the provided information, Ricky Lee Muir was only elected in the 2013 election and not in the 2016 election. Conclusion: Based on the paragraph above, we cannot conclude that "Ricky Lee Muir won multiple elections" as he only won the 2013 election.

answer:(B). Positive. This phrase seems positive because it describes the film as "naturally funny," suggesting it is enjoyably humorous or amusing. It's like saying the movie is so wonderfully funny that it makes people laugh without even trying hard!

answer:The tone of this product review can be characterized as predominantly positive, with a few minor negative aspects. The reviewer highlights the enjoyment they experienced with the product, stating that it is "the most fun I have ever had since I was a kid." Additionally, they emphasize the affordability of the micro helicopter and how well-suited it is for indoor use. They describe it as an ideal toy for their office environment with high ceilings and specifically mention that it should not be used outdoors due to the risk of getting stuck in trees. Despite the overall positive nature of the review, the reviewer does note some negative points. They express a desire for more durable blades, as they have encountered issues with cracking after collisions or falls from significant heights. However, they also mention that the body of the helicopter holds up well, which balances out the criticism to some extent. The reviewer concludes with their enthusiasm for the product and a wish that such toys had been available during their childhood. They also indicate that they might upgrade to a twin-blade helicopter next, suggesting continued interest in similar products. In summary, the tone of this product review is primarily positive, praising the fun, affordability, and indoor suitability of the micro helicopter, with a few minor critiques regarding the durability of specific parts.