Frederick William I, the King of Prussia, ____ that his greatest gift to the Russian people would have ____. This gift was the Amber room, which was given this name because several tons of amber were used to make it. The amber ____ had a beautiful yellow-brown colour like honey. The design of the room was ____ popular in those days. It was also a treasure ____, which took the country's artists about ten years to make.

1907年，欧洲各国在海牙召开了第二次和平大会，其主要任务是制定“尽可能人道”

的战争行为准则。从以后十年的历史看，这样的“准则”所起的主要作用是 (　　)

利用图示仪器测量氧气体积，来测定高锰酸钾样品的纯度（杂质不参加反应）。