推导了进入双点啮合区的法面啮合角公式，采取了独特的剃齿刀修形方式，从设计和修形上下功夫杜绝剃齿中凹的产生。
And the normal engagement angle of approaching double-point tooth area is deduced. The special dressing method of shaving cutter has been adopted.
系统给出了四种防止剃齿中凹的方法，用户可根据不同的生产条件进行选择，对每种方法的应用，系统软件都给予了指导。
Users can select from these methods according to their production condition. There is instruction for applying each method in the expert system.
弯月面容器中之静止液体的弯曲上表面，如果液体浸润了容器壁，那么弯曲面呈凹状。
The curved upper surface of a nonturbulent liquid in a container that is concave if the liquid wets the container walls.
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