表壳直径：43毫米。
In the case of constant pipe diameter, lengthening the length of vacuum tube is an effective way to increase the total heat of solar water heater!
在管径恒定的情况下，加长真空管的长度是增加太阳能热水器总得热量的有效途径和方向！
This paper presents the application of unbonded prestressed concrete technique to cylindrical shell with big diameter through an engineering case.
通过工程实例，介绍无粘结预应力混凝土技术在大直径圆柱壳中的应用。
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