单选题An over-speed trip serves to （）Astop the engine by cutting off the cooling water supplyBstop the engine by closing the air intakeCslow the engine but not stop itDslow the engine to half of normal load
单选题
An over-speed trip serves to （）
A
stop the engine by cutting off the cooling water supply
B
stop the engine by closing the air intake
C
slow the engine but not stop it
D
slow the engine to half of normal load
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