The oil is drawn from a drain tank through （）, one of a pair of pumps, into one of fine filters.<br>A:a strain tank<br>B:a head tank<br>C:a service tank<br>D:a strainer

The oil is drawn from a drain tank through （）, one of a pair of pumps, into one of fine filters.
A:a strain tank
B:a head tank
C:a service tank
D:a strainer

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