Plastics cover, completely enclosed, without screws, requires no earth grounding.

全塑外壳， 完全密封， 无外加螺钉， 无需接地线路。

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Polystyrene foamed plastics and GR6 used to cover the surface of grain bulk for insulation heat were tested.

本试验选用聚苯乙烯泡沫塑料和GR6作为隔热材料进行粮面压盖隔热保冷试验。

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It was considered that the main cause of plastics weathering was sun's rays, and that plastics packaging box should not be stored without any cover in outdoor.

认为太阳光是影响塑料老化的主要原因，塑料包装箱不宜在户外无遮避贮存。

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The top has both the power and mute keys with the entire thing wrapped lovingly in plastics with some metal trim on the edges and a metal battery cover.

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