题目内容
生产水泥时加入石膏是为了提高水泥早期强度。
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硅酸盐水泥熟料矿物组分中,水化速度最快的是硅酸三钙。
不掺加混合材料的硅酸盐水泥的代号为P·I。
With so many laptops, smartphones and ______________ connections all around us, we are really in the new age of ______________ now, which affects colleges, universities and their students to a great extent.When it comes to campus life, the undergraduates are the group most eager to use new electronic wonders, which can help them with many aspects of their ______ life both in and out of class. Professors also benefit from this, like taping their lectures and _______ them online. So, non-stop ______ to the Internet is of great help to teaching and learning on campus.As for colleges and universities, the Internet is the focus of competition. Most of them have spent a great deal of money establishing easy access to the Internet to avoid being at a __________ disadvantage. Furthermore, some of them request all their students to own or _____ a laptop in order to prepare them for such a _____ world. Meanwhile, many computer _____ and 24-hour repair shops have been built on campus to help students with their study. All of these have already brought about wonderful _______ in education.
不是构成气动三联件的是( )。
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