answer:```javascript import { inject, reactive } from 'vue'; const useQueue = () => { const eventBus = inject('eventbus'); const state = reactive({ items: [], queueRunning: false }); const isEmpty = () => { return state.items.length === 0; }; const addToQueue = (item) => { item.fromQueue = true; item.step = 3; state.items.push(item); console.log('Queue: adding item to queue: ' + state.items.length, "queueRunning: " + state.queueRunning, state.items); if (!state.queueRunning) { console.log('Queue: added To Queue, start play cause queue is running ', "queueRunning: " + state.queueRunning); playQueued(); } }; const playQueued = () => { state.queueRunning = true; console.log('Queue: playQueued, queue length is: ', state.items.length); // fifo const item = state.items.shift(); item.step = 4; console.log("Queue: playQueued trigger eventBus", item.type, item); eventBus.emit(item.type, item); }; const playQueuedEnded = (event) => { event.target.removeEventListener('ended', playQueuedEnded, true); if (isEmpty()) { state.queueRunning = false; console.log( 'Queue: playQueuedEnded no more entries in queue: ' + state.items.length, state.queueRunning, ); } else { console.log( 'Queue: playQueuedEnded item ended, remaining items: ' + state.items.length, state.queueRunning, ); console.log('Queue: setting timer for next run: ', config.settings.alerts.queueTimeDistance); const queueTimeDistanceTimeout = window.setTimeout(playQueued, config.settings.alerts.queueTimeDistance); } }; return { state, isEmpty, addToQueue, playQueued, playQueuedEnded }; }; export default useQueue(); ```

answer:EGR stands for Exhaust Gas Recirculation. It's an emissions reduction technique used in internal combustion engines, primarily in diesel and gasoline engines. The EGR system works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. By introducing the exhaust gas into the combustion chamber, the combustion temperature is reduced, which in turn reduces the formation of Nitrogen oxides (NOx), which are harmful pollutants. The principle behind this is that exhaust gases do not combust, so by replacing some of the oxygen in the intake with exhaust gases, the combustion temperature can be lowered. High combustion temperatures are a major source of NOx, so reducing these temperatures limits NOx emissions. EGR systems can be either mechanical or electronic, and their use can impact engine performance and efficiency in various ways, including altered fuel consumption patterns and sometimes increased deposits within the engine, if not properly managed. Due to stringent emissions regulations, EGR systems are common in modern vehicles as part of the overall strategy to reduce vehicular emissions and improve air quality. However, they require careful design and management to balance the reduction in NOx emissions with potential impacts on engine performance and maintenance needs.

answer:```javascript import { inject } from 'vue'; import { ref } from 'vue'; const useQueue = () => { const eventBus = inject('eventbus'); const items = ref([]); const queueRunning = ref(false); const isEmpty = () => { return items.value.length === 0; }; const addToQueue = (item) => { item.fromQueue = true; item.step = 3; items.value.push(item); console.log('Queue: adding item to queue: ' + items.value.length, "queueRunning: " + queueRunning.value, items.value); if (!queueRunning.value) { console.log('Queue: added To Queue, start play cause queue is running ', "queueRunning: " + queueRunning.value); playQueued(); } }; const playQueued = () => { queueRunning.value = true; console.log('Queue: playQueued, queue length is: ', items.value.length); // fifo var item = items.value.shift(); item.step = 4; console.log("Queue: playQueued trigger eventBus", item.type, item); eventBus.emit( item.type, item ); }; const playQueuedEnded = (event) => { event.target.removeEventListener('ended', playQueuedEnded, true); if (isEmpty()) { queueRunning.value = false; console.log( 'Queue: playQueuedEnded no more entries in queue: ' + items.value.length, queueRunning.value, ); } else { console.log( 'Queue: playQueuedEnded item ended, remaining items: ' + items.value.length, queueRunning.value, ); console.log('Queue: setting timer for next run: ', config.settings.alerts.queueTimeDistance); var queueTimeDistanceTimeout = window.setTimeout( playQueued, config.settings.alerts.queueTimeDistance ); } }; return { isEmpty, addToQueue, playQueued, playQueuedEnded }; }; export default useQueue; ```

answer:When managing multiple versions of Python on a single system, transferring libraries from an older version to a newer version can be done in several ways. However, it's important to note that simply transferring libraries might not always be the best approach due to potential compatibility issues between library versions and the Python versions themselves. It's often recommended to reinstall the libraries to ensure that you're using versions compatible with your new Python installation. Here are general steps you can take to transfer or reinstall your libraries: # 1. Using `pip list` to Generate a Requirements File Firstly, you can generate a list of your currently installed libraries in the older Python version environment. This can be done by using the `pip list` command combined with some command-line text processing tools to create a requirements file: 1. Activate the environment for your older Python version. 2. Run the following command to generate a `requirements.txt` file: ```sh pip freeze > requirements.txt ``` 3. This file now contains a list of your installed packages along with their versions. # 2. Installing Libraries in the New Python Version After generating the `requirements.txt` file, you can use it to install the libraries in the environment of your new Python version: 1. Activate the environment for your new Python version. 2. Install the libraries using the following command: ```sh pip install -r requirements.txt ``` # If Direct Library Transfer is Needed (Not Recommended) In rare cases, you might want to manually copy the libraries from one environment to another. This involves copying files from the `site-packages` directory of the old Python environment to the `site-packages` directory of the new one. However, this method is error-prone and can lead to incompatibility issues, so it's generally not recommended. # Additional Considerations - **Virtual Environments**: It's a good practice to use virtual environments for Python projects to manage dependencies more effectively. If the libraries you're transferring are in a global environment, consider using a virtual environment for your new setup. - **Compatibility Issues**: Not all Python libraries are backward or forward compatible. After transferring, test your environment thoroughly to ensure that all libraries work as expected. - **Manual Installation**: In some cases, especially if you encounter errors with specific packages, it might be necessary to manually install or update those packages using `pip install package_name --upgrade`. Remember, keeping your libraries and Python versions up to date is crucial for taking advantage of the latest features and security updates. Using virtual environments for separate projects can help manage dependencies more efficiently and reduce the need for transferring libraries between different Python versions.