A.to increase
B.to speed up
C.to prevent
D.to reduce
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A.taken away
B.engaged
C.connected
D.sealed off
A.overhaul
B.running
C.blowing down
D.All of the above are correct
A.reciprocating
B.rotating
C.running
D.removing
A.bedplates
B.columns
C.cylinder blocks
D.safety caps
A.mixed with clean oil
B.purified
C.heated
D.strained
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Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.
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The minimum speed an engine must attain before ignition can occur depends upon （）.