Question

why the railway crossig is buiiton on ronds on the traks tairan?​

Answer 1

Answer:

The basic signal consists of flashing red lights, a crossbuck and a bell, attached to a mast. At most crossings, the signals will activate about 30 seconds before the train arrives. In some countries (such as the Czech Republic or Slovakia) there is also flashing white light, which means it is safe to cross.

Explanation:

Answer 2

Answer:

A sieve is a shallow vessel having small holes at its bottom