题目内容

下列哪项不是液体动压油膜形成的必要条件？（）

A. 相对运动表面间必须形成收敛的楔形间隙
B. 两运动表面间必须有一定的相对滑动速度，其运动方向必须使润滑油从大口流进、小口流出
C. 润滑油必须有一定的粘度，且供油要充分
D. 轴瓦上不能开油孔或油沟

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