查询词典 helicoidal surface

In fact, the mean curvature and Gauss curvature of any helicoidal surface are independent on rotation parameter.

事实上，三维Minkowski空间中任意螺旋面的平均曲率和Gauss曲率都与旋转参数无关。

Thus, combining this work with Benekis work, we prove that there exist any type of helicoidal surface with mean curvature or Gauss curvature being any smooth function.

这样结合Beneki等人的工作，本文证明：三维Minkowski空间中，平均曲率或Gauss曲率为任意给定光滑函数的任意一类螺旋面都是存在的，并给出了具体的参数表达式。

A helicoidal surface in Minkowski 3-space is defined as the orbit of a plane curve under a screw motion.

三维Minkowski空间中的螺旋面是一条平面曲线经由螺旋运动所生成的曲面。

Especilly, we prove that any pseudo-umbilical helicoidal surface in Minkowski 3-space is a ￡?-scroll.

其中后两类类时伪全脐曲面的形状算子不能对角化，它们在三维Euclidean空间中没有

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。