4. Aluminum-polyethylene, the sheath used for riser cable where a flame retardant sheath is required.
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The hydrodynamic-fluid model and the self-consistent dust charging model are used to investigate the Bohm criterion for the dusty plasma sheath.
采用流体方程和自洽电荷变化模型研究了尘埃等离子体鞘层的玻姆判据。
The thermal insulation materials used for installation should be ensured complete dry and any wet the same should be replaced and changed before installation of the metal outer sheath.
施工单位在安装保温材料时应确保保温材料完全干燥，凡受潮的保温材料在金属外护层安装之前应当更换。
The upper surface mounting points (30) for the sheath (22) can be used for positioning of the sheath, and enable the sheath to be grouted into position in a one stage process.
用于外壳（22）的上表面安装口（30）可用于外壳的定位，并可使 得外壳在单步骤过程中被灌浆入就位。
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