长久以来，西方钻石凭借其永恒性与稀有性，在爱情象征领域占据一席之地。据公开资料，钻石巨头“戴比尔斯”近年来屡次削减毛坯钻石价格，降幅高达40%以上，这场“价格风波”不仅震撼业界，还促使另一巨头“阿尔罗萨”试图通过销售暂停来平稳市场，不过未能奏效。从云 ...

As per the initial student reactions, the paper was moderately difficult. To help the students in assessing their performance ...

A team of researchers from Shenzhen Institutes of Advanced Technology, China has developed a power-free device to extract ...

据《2024年培育钻石产业发展白皮书》数据，2023年全球培育钻石毛坯产量逼近3000万克拉，中国占据全球市场70%以上份额，其中河南贡献全国8成，连四线柘城都年产400万克拉，一年创收200亿！

Cell culture is an important and necessary process in drug discovery, cancer research, as well as stem cell study. Most cells are currently cultured using two-dimensional (2D) methods but new and ...

Get a detailed paper analysis, question paper, and answer key. Check expert reviews, difficulty level, and expected answers ...

A material’s response to an applied magnetic field can be characterized as diamagnetic, paramagnetic, ferromagnetic or antiferromagnetic. Four-coordinate cobalt(II) complexes possess high energy ...