进入油箱的水受到油泵、马达等液压元件的剧烈搅拌后,容易分散于液压油中,形成乳化液,再进入整个液压系统。因此要求液压油必须具有良好的()性。
参考答案:抗乳化
We are all busy talking about and using the Internet. But how many of us know the history of the Internet?
At first the Internet was only used by the goverment . 小题1: But in the early 1970’s , universities, hospitals and banks are allowed to use it , too . However, computers were still very expensive and the Internet was difficult to use. By the start of the 1990’s, computers became cheaper and easier to use. Scientists had also developed software that made “surfing” the Internet more convenient.
小题2:Today it is easy to use the Internet and sending e-mail is more and more popular among students. The Internet has now become one of the most important parts of people’s life.
从定义企业过程中,应获得( )结果和资料。 Ⅰ.过程组和它们所含过程的目录 Ⅱ.各个过程的说明 Ⅲ.关键过程名 Ⅳ.产品/服务流程图 Ⅴ.研究组对整个企业的理解和分析
A.Ⅰ,Ⅱ和Ⅲ
B.Ⅰ,Ⅲ,Ⅳ和Ⅴ
C.Ⅱ至Ⅴ
D.全部