单选题What is the purpose of a striker plate? （）AProvides surface for applying force on machineryBProvides landing surface for the sounding bobCAbsorbs machinery vibrationDPrevents valve stem over-travel
单选题
What is the purpose of a striker plate? （）
A
Provides surface for applying force on machinery
B
Provides landing surface for the sounding bob
C
Absorbs machinery vibration
D
Prevents valve stem over-travel
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