环形管是截面呈环形(中空圆形)的管状构件,由金属(钢、铜等)、塑料(PVC、PE等)、混凝土等材料制成,核心功能是输送流体(水、油、气等)或保护线缆。 其优势在于同等材料用量下,环形截面抗内外压力、抗弯曲性能更强,且流体输送阻力小。
MASTER LEDtube GA MASTER LEDtube GA 1200mm 22W 840 G13 Philips MASTER LEDtube integrates a LED light source with a frosted cover design into the traditional linear fluorescent form factor. The new light source offers natural light colors while consumes 22W system energy when used to replace a TL-D 36W with electromagnetic ballast, resulting in up to 50% energy saving. The product ’ s long lifetime