Refining Knowledge (Technology) Daily Question 110505 (Issue 116), Total Issue 363

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This post was last edited by lijianhuai on 2011-8-5 09:44. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the refinery processing technology exchange area! In accordance with the forum’s unified requirements, the maximum score for this event is 5 Wealth points, and scoring based on charm is prohibited. Friendships and duplicate ratings are also declined. Be careful when posting; editing is ineffective. Those who have different opinions on the provided answer keys can post discussions the next day; those who provide solutions or their own opinions regarding the answer key for the daily question will receive appropriate rewards! The focus is on participation, and there are prizes for participating. Please hide the reply; those that are not hidden will be deleted. Instructions for hiding replies: Click on \"Hide\" in the title menu (the option will become visible when the mouse is placed over it), and then place the content that you want to hide between \"hide\" and \\/hide\. For more details, see http://bbs.hcbbs.com/thread-492556-1-1.html. True or False questions: 1. In experiments, stress and strain are always in direct proportion to each other. ( ) 2. The main cause of fatigue fracture is the presence of various defects in the material. ( ) 3. A high sulfur content in carbon steel can cause it to become thermally brittle. ( ) 4. The length of time material is held at a certain temperature during heat treatment has no effect on the final structure of the material. ( ) 5. Heat treatment is a chemical reaction. ( ) ×√√× ×