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【单选题】
关于刮油环下列说法正确的是（）。
A.
刮油环有径向，刮油环无径向
B.
刮油环刮下的滑油从活塞与气缸之间的间隙泄回曲轴箱
C.
刮油环的小量泵油作用保证上部环的润滑
D.
靠背隙中气体压力作用使刮油环与缸壁的接触压力增加，保证刮油效果
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