The necessary data, such as the physical mechanic properties, the hydraulic characteristics, the permissible Working pressure, and the suitable sizes of the hose, etc.
有些方面如物理力学性状、水力性能指标、允许工作压力、以及管材的适宜规格等方面也缺乏资料。
The result shows that sample dimension has light influence on wood physical properties, but different degrees of influence on wood mechanic properties.
结果表明：木材物理性质一般受试样尺寸的影响较小；木材力学性质则不同程度地受到其影响。
The overlying strata of the coal bed roof are dominated by sedimentary rocks such as shale, sand stone and limestone, whose physical and mechanic properties differ greatly.
煤层顶板覆岩一般以页岩、砂岩、灰岩等沉积岩为主，其物理力学性质差异很大。
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