理工类教程汇总和更新

　　1. Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European coloniz... [查看全文]

　　2017年职称英语考试<理工C级>词汇选项试题及答案　　1.We need to extract the relevant financial data.　　A, store　　B. ... [查看全文]

　　Characteristics of Publicity　　Publicity offers several benefits. There are not costs for message time or space... [查看全文]

　　By the time the Montgomery Improvement Association chose the 26-year-old Martin Luther King Jr. as its leader,... [查看全文]

　　The Visually Impaired Person　　Visual impairment (损害) carries with it a reduced or restricted ability to tra... [查看全文]

　　Winged Robot Learns to Fly　　Learning how to fly took nature millions of years of trial and error—but a wi... [查看全文]

Mobile phones should carry a label if they proved1 to be a dangerous source of radiation, according to Robert B... [查看全文]

what if如果……将会怎样，即使…又如何whether…or是…还是，不管…还是and yet可是，然而ever since从那时起，自那时以来ever so非常... [查看全文]

　　however，whereas，while，yet　　这组词都含 而、然而、却 等转折的意思。　　however： 然而、可是 语气较弱, 联接也较少松弛.... [查看全文]

下面每个句子中均有1个词或短语划有下划线，请为每处划线部分确定1个意义最为接近的选项。1.I remember him. He did some marvelous... [查看全文]