【名词&注释】
冷凝器(condenser)、冷却水(cooling water)、冷却器(cooler)、散热器(radiator)、自动变速箱(automatic transmission)、四轮驱动(four-wheel drive)、转弯半径(turning radius)、载重量(load carrying ability)、往复式内燃机(reciprocated internal combustion engine)
[单选题]假设往复式内燃机(reciprocated internal combustion engine)的气缸总容积是Va,工作容积是Vh,余隙容积是Vc,下列式中正确的是()
A. ε=Vh/Va
B. ε=Vh/Vc
C. ε=Vc/Va
D. ε=1+Vh/Vc