单选题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.AescapesBoverheatsCexpandsDaccelerates
单选题
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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