void free_some_phase2(int classno) {
Industrial production of kanten (the Japanese name for agar, which translates as “cold weather” or “frozen sky”) began in Japan in the mid-19th century by natural freeze drying, a technique that simultaneously dehydrates and purifies the agar. Seaweed is first washed and boiled to extract the agar, after which the solution is filtered and placed in boxes or trays at room temperature to congeal. The jelly is then cut into slabs called namaten, which can be further processed into noodle-like strips by pushing the slabs through a press. These noodles are finally spread out in layers onto reed mats and exposed to the sun and freezing temperatures for several weeks to yield purified agar. Although this traditional way of producing kanten is disappearing, even today’s industrial-scale manufacturing of agar relies on repeated cycles of boiling, freezing, and thawing.
。WPS下载最新地址对此有专业解读
Tim Fernholz is a journalist who writes about technology, finance and public policy. He has closely covered the rise of the private space industry and is the author of Rocket Billionaires: Elon Musk, Jeff Bezos and the New Space Race. Formerly, he was a senior reporter at Quartz, the global business news site, for more than a decade, and began his career as a political reporter in Washington, D.C.。业内人士推荐Line官方版本下载作为进阶阅读
2026-02-28 00:00:00:03014272910http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142729.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142729.html11921 2026年中国载人航天工程将深化推进空间站应用与发展、载人月球探测两大任务