佛尔哈德法以为指示剂，用为标准溶液进行滴定。根据测定对象不同佛尔哈德法可分为直接滴定法和返滴滴定法，直接滴定法用来测定，返滴定法测定。

A. The big yellow letters IKEA on a blue background can been seen from far away.
B. We had to pass through a big door that turned like a wheel before entering the shop.
C. The billboard of IKEAis lower than the trees
D. About ten people can walk inside one section of the wheel.

A. Children can play for 2 hours or just one hour on busy days.
B. It is suitable for thosechildren aged 2 to 6.
C. They give parents a piece of paper with the time of collection written on it
D. They send the children to their parents.

A. There everything is self-service.
B. You take a tray and ask people to serve you food.
Coffee, tea or a fizzy drink are free and you fill it from a machine.
D. You can read magzines and books while you eat and drink.