A full-flow 50μm filter is installed ,（） so the injection system components on the main engine are safeguarded.<br>A:as close to the main engine as possible<br>B:as close to the main pump as possible<br>C:just before the fuel valve<br>D:just before the booster pump

A full-flow 50μm filter is installed ,（） so the injection system components on the main engine are safeguarded.
A:as close to the main engine as possible
B:as close to the main pump as possible
C:just before the fuel valve
D:just before the booster pump

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