When in operation, it is unavoidable that a small amount of oil （） through leakage, and in order to compensate for these leaks the system is connected to a feed pump.<br>A:escapes<br>B:overheats<br>C:expands<br>D:accelerates

When in operation, it is unavoidable that a small amount of oil （） through leakage, and in order to compensate for these leaks the system is connected to a feed pump.
A:escapes
B:overheats
C:expands
D:accelerates

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