单选题(Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）Abrake horsepowerBdisplacementCcylinder volumeDcylinder clearance
单选题
(Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）
A
brake horsepower
B
displacement
C
cylinder volume
D
cylinder clearance
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