в количестве

• The uranium, thorium, and potassium together supply heat at a rate of 3*10^-9 W/ton.

• The events take place at a rate of only a few per day.

• Benzaldehyde is produced at the rate of about 2,000,000 lb annually.

• Barium is found to the extent of 0.04% in the earth's crust.

• Lactose is present in milk to the extent of about 4 percent.

• Iron may be added for particular purposes in amounts of 1% or more.