Chitoliro cha polyethylene of Raised Temperature (PE-RT) ndi chitoliro chapamwamba cha pulasitiki chokhazikika chokhazikika chotenthetsera pansi ndi kuziziritsa, mipope, kusungunuka kwa ayezi, ndi makina opangira mapaipi apansi, omwe akudziwika kwambiri masiku ano. T...
Werengani zambiri