判断题 湍流附加切应力普遍存在于层流和湍流中。（ ）

未知题型 中性侵入岩的色率为60-80之间。

未知题型 DECA Assignment 2: Design & Create Directions: Design an English classroom teaching activity and create a mini lesson plan. Then, if possible, implement it. You are required to submit a detailed lesson plan for the activity you are to design. The implementation part is only optional. You are more than welcome to share your experience of implementing the activity in our forum. *This assignment is to be graded by the Teaching Team and a grading rubric is provided to guide you towards the best work possible. When you design an activity, think about the following questions: 1. For whom do I design this activity? 2. What’s the purpose of the activity? 3. What is the name of the activity? 4. What are the steps of the activity? 5. What materials are needed? When you create your mini lesson plan for the activity, include: 1. Name of the activity 2. Clear learning objectives 3. Targeted learners 4. Concise instructions 5. Necessary materials A tip Please proofread your assignment before you submit. Make sure to correct any spelling and grammar mistakes you might have made. Also make sure all the ideas are clearly developed. Remember: In this course you are learning NOT ONLY how to design an English classroom activity BUT ALSO how to improve your own speaking and written English. Guidelines When we grade the activity designed by you, we are going to use the following questions. Hope you find them helpful. 1. Is the activity name good enough? 2. Is the purpose of the activity clear? 3. Is the activity suited for the specified learner group? 4. Are the instructions/steps of the activity concise? 5. Is the expected outcome likely to be achieved? 6. Is the language clear?