The features of shock wave can be analyzed qualitatively in the velocity plane for a special perturbed gravitation which is used to simulate the self-gravitation of interstellar gas.
对一种特定的扰动引力场模拟气体自引力，可以在速度平面上定性分析激波解的特性。
Take the pipe as an isolator, under the effect of the external load and the mid-plane gravitation mentioned above, the displacement, the internal force and the internal moment can be worked out.
将管道作为隔离体，在外载荷及前述中面应力的影响下，求位移、内力、内力矩。
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