单选题The oil is drawn from a drain tank through （）, one of a pair of pumps, into one of fine filters.Aa strain tankBa head tankCa service tankDa strainer
单选题
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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