I want to know the answer to the following question:
What is commonly written with a single character formed by combining the last character with the radical of the first?
All the background I'm provided with is that "However, in the 19th century these were often written via compound characters, pronounced disyllabically, such as 瓩 for 千瓦 or 糎 for 厘米 – some of these characters were also used in Japan, where they were pronounced with borrowed European readings instead.". Is that enough to answer the question?
Answer: no