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百度试题 题目 What ___ used as chief building materials today ___ steel and concrete. A.have been, areB.is, areC.are, areD.are, is相关知识点: 试题来源: 解析 C
automation of the process delivered cheaper pins and, no doubt, cheaper nails too. Sichel agrees: although the falling price of nails was driven partly by cheaper iron and cheaper energy, most of the credit goes to nail manufacturers who simply found more efficient ways to turn steel into ...
百度试题 结果1 题目What___used as chief building materials today___steel and concrete. A. have been . . . are B. is . . . are C. are . . . are D. are . . . is 相关知识点: 试题来源: 解析 答案:C
百度试题 结果1 题目What ___ used as chief building materials today __ steel and concrete. A. have been … are B. is … are C. are … are D. are… is 相关知识点: 试题来源: 解析 C. are … are D. are … is
what ---used as chief building materials today ---steel and concrete.c.are are d are is 答案 选arewhat ARE used as chief building materials today如果变成陈述句,steel and concrete are used as chief building materials today, 主语一眼就看出是复数steel and concrete (钢筋和水泥是两种物质,是复...
(Credit: Unsplash) This article is brought to you thanks to the collaboration of The European Sting with the World Economic Forum. Author: Marie McAuliffe, Head, Migration Research, International Organization for Migration (IOM) The world is in danger of
Stainless steel is a corrosion-resistant alloy of iron, chromium and, in some cases, nickel and other metals. Completely and infinitely recyclable, stainless steel is the “green material” par excellence. In fact, within the construction sector, its actual recovery rate is close to 100%. ...
Steel is structurally lighter than iron. This has a massive impact on overall building costs during construction. Producing steel is also considered to be a cheaper process than iron. The grade of steel will impact its price. So too will a higher-grade impact the price of iron. Stronger iron...