The world's best-selling grammar series for learners of English. Raymond Murphy's classic reference and practice book for learners of English at intermediate (B1-B2) level. Perfect for self-study, but ...

The world's best-selling grammar series for learners of English. Raymond Murphy's classic reference and practice book for learners of English at intermediate (B1-B2) level. Perfect for self-study, but ...

The English language can be seriously perplexing. These 20 rules even boggle the minds of grammarians. Find out which ones you're using wrong, how to fix them, and which ones you can get away with ...

Remind yourself of important facts about English grammar with our reference pages.

Improve your grammar with 6 Minute Grammar - medium, our grammar series for medium level learners. On this page you'll find a range of medium level grammar programmes to boost your language skills.

The SmartDV Verification IP (VIP) for DALI provides an efficient and simple way to verify the DALI protocol bus. The SmartDV s VIP for DALI is fully compliant with IEC 62386-101 Edition 2.0 ...

intitle:和后面的关键词之间不要有空格。 在搜索中加入“Filetype:”可以限定在文档格式中搜索网页信息，支持文档格式有pdf，ps,dwf, kml, kmz, doc，xls，ppt，rtf,swf,all(所有上面的文档格式)。对于找文档资料相当有帮助。 例如：photoshop实用技巧 filetype:doc**** 高级搜索 ...

Why Are PDFs So Hard to Edit? As a format, the PDF was devised before people used web browsers, and as mentioned, it's based on the idea of a printed page. That means you can't add a few lines of ...

It’s still one of the best free PDF readers out there - Adobe invented the filetype, after all. You can read PDFs on any device, it’s simple to use, with some great default tools. But we’re ...

PDF files have become a major part of our digital lives in this cross-platform world. While simply viewing or commenting on a PDF can be accomplished with free software, there are times when we ...