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单选题
108. Engine-driven pumps are primary pumps which run continuously when they are turned on
A
The engine-driven pump is the major pump that works endless when it is switched on.
B
The engine-driven pumps are the main pumps that runs continuously during operation.
C
The engine-driven pumps are the secondary pumps that operates infinitely after running.
答案解析
正确答案：B
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