【多选题】塑性是指材料在外力作用下发生塑性变形而不被破坏的能力。也就是说,材料 持续 发生塑性变形的量越大,塑性就越 (好,差)。而发生塑性变形所需的外力大小与塑性的好与差无关。容易发生塑性变形的材料,其塑性未必就好,反之亦然。反映塑性好坏的指标有两个,即断后 和截面收缩率,前者的代号为δ,后者的代号为ψ,它们都是没有单位的量。
【简答题】Readin g C omprehension Directions: In this part, there are two passages followed by questions or unfinished state ments, each wi th f our suggested answers marked A, B, C, and D . Choose the one th a...
【简答题】Getting the Writer's Purpose There are a number of ways that a writer can use to convey the purpose of writing and the writer's attitude. These include: How the text layout uses headings, subheadings,...
【简答题】从B栏中选出A 栏的答语。 A ( ) 1. May I go shopping? ( ) 2. If you work hard in school, you may go with us. ( ) 3. When do you leave for America? ( ) 4. How far is it from China to Canada? ( ...
【单选题】If you work with a strong will,you will overcome any difficulty___great it is.
【单选题】材料的伸长率、断面收缩率数值越小,表明其塑性越好。()
【单选题】The wonderful work you have finished in the country will . [ ]
【多选题】Fill in the blanks with the proper words given below, changing the form if necessary.(请用下列单词的正确形式填空) comfortably; instruction; apologize; residence; available; accommodation; service; additional; inco...
【简答题】词形变换。 1. If you work hard, you'll___________(success) in the exams. 2. Thank you very much for giving us some___________(value) advice. 3. One of my__________(hobby) is to collect stamps. 4. You must ...