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from the 1st to the last day of the month from the 1st to the 15th of the month from the 1st to the 10th of the month from the 1st to the 5th of the month
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from the 1st to the last day of the month from the 1st to the 15th of the month from the 1st to the 10th of the month from the 1st to the 5th of the month
from the 1st to the last day of the month from the 11th to the last day of the month from the 15th to the last day of the month from the 21st to the last day of the month
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from the 25th to the 31th of May from the 20th to the 31th of May from the 21th to the 31th of May from the 16th to the 31th of May
on：and from：and and；to from；to
How often How soon How long How many
remove suspended and precipitated solids from the boiler water completely drain the boiler in an emergency situation prevent hardened scale deposits in the water drum remove floating impurities from the oily water surface
from the 11th to the 20th of May from the 15th to the 25th of May from the 10th to the 20th of May from the 16th to the 31st of May
from the 10th to the 20th of the month from the 11th to the 20th of the month from the 11th to the 21th of the month from the 10th to the 21th of the month
from the 1st to the 30th from the 15th to the 30th from the 10th to the 20th from the 1st to the 15th
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