This paper Tops reviews the investigation status of the techniques for preparation of metal matrix composites and the research outcomes achieved recently.The mechanisms, characteristics, application ranges and levels of development of these preparation techniques are analyzed.The advantages and the disadvantages of each technique are synthetically

Restaurants and other interactive service workplaces in the United States serve as labor niches for two very different kinds of workers doing different tasks.Immigrant Latinos primarily work “back-of-the-house” jobs doing manual tasks, while class-privileged whites work “front-of-the-house” jobs performing customer-facing tasks.How do these