Какой объем 30 % раствора NH3 (плотность 0.892 г/мл) необходимо добавить к 200 мл 40% раствора HCl, плотность 1,198 г/мл, чтобы массовая

This is the season when it is hot, when you can swim in the river and when vegetables grow.

This is the season when you have the longest holidays.

(Summer)

This is  the season when the weather is cold. Usually it snows.
The days are short and the nights are long.
The rivers and lakes freeze and we can go skating and skiing.
(Winter)

This  is the  season when the birds return from the hot countries.

Winter’s gone away.

 (Spring)

This is the season when the birds prepare to fly to the South.

The days become shorter and the nights become longer.
(Autumn)