题目内容

金属液体在凝固时产生临界晶核半径的大小主要取决于 ______ 。

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既能提高金属的强度，又能降低其脆性的手段是 ______ 。

位错线是晶体中与在滑移面上的交界线，刃型位错的伯氏矢量与其位错线，螺型位错的伯氏矢量与其位错线，混合型位错的伯氏矢量与其位错线 __ 。

NaCl晶体结构中，原子的配位数为______ 。

Fill in the blanks with the proper forms of the given expressions. appeal to, give rise to, be faced with, shed light on, expose … to, confer … on, be consumed by, make one’s mark, deprive … of, take on1. Since he became interested in chamber music, his life a new dimension. 2. Many parents cannot understand why their kids a passion for Black music, although they used to dance to it when they were young. 3. I thought I had many friends, but when I financial problems, there was no one I could turn to. 4. If a person adequate sleep, you cannot expect them to function properly. 5. I wish he could give up his beliefs, for which he ridicule. 6. The idea of going to Switzerland for the winter vacation and spending a whole month skiing really me. 7. John worked with us for only two years, but he obviously on the office. 8. We trusted him so much that we him the role of “our resident tutor.” 9. I had been working on the engine for two hours but couldn’t fix it, so I asked Bill to have a look, hoping that he could the problem. 10. Covid-19 suddenly struck again in Beijing, which hesitation about letting students go back to the classroom.