Symmetry is an essential concept in mathematics， science and daily life， and an effective mathematical tool to describe symmetry is the notion of gro...

本书以中国在参与国际交流与合作的相关新闻报道为主线，通过选编对于中国近十年来国际交往的故事和报道，让学习者了解中国与世界各国关系的重大事件，深入理解中国与各国关系的政策及其在世界交流合作中的地位，并领悟感知中国文化内涵。从具体案例出发，提高在正式语域得体使用中文的能力，学习从国际合作交流的视角学习讲...

About Author Liang Heng, scholar, wiiter and news theorist, has served as deputy editor-in-chief of People's Dail.y, and received major literary...

This book provides a collection of latest simulated tests of HSK (Advanced). Based on more than ten year's experiences in teaching Chinese as a...

...

Usage Advice: Used for students' test-preparation and self-testing Level: Intermediate, Advanced Designed on the basis of the New HSK Chinese...

With the introduction of China's high-speed railway to the world, the successful experience in comprehensive consideration of civil engineering...

This book is one of the excellent textbooks for colleges and universities of Jiangsu Province in 2018, which is based on the demand for mechanical...

This book conducts research on the overall design of the submerged floating tunnel, structural safety standards, environmental load calculation...