Mr指金属线槽，ct指槽式桥架 比如：ct 400x200/ce： 宽400x高200的 电缆桥架 沿天棚或顶板面敷设 mr 200x100/ct：宽200x高100的金属线槽，沿电缆桥架敷 扩展资料： 槽式桥架也.
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