| 摘要 |
In the water channel, a portion is formed of seamless pipe (14), a longer section is composed of quadratic cross-section surfaces and the shorter section composed of pipe neck (13) having smaller cross-section. Preferred features: The pipe neck (13) is composed of spherical cross-sectional shapes. The two longer sections (12) of the pipe (14) are made of quadratic cross-section surfaces and between the two sections is a shorter section with a pipe neck (13) having smaller cross-section surface. The shorter section runs below the both the longer sections (12) forming quadratic cross-section.
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