coper造句怎么写

Wrot copper performs well in high temperature applications and is easily joined by soldering or brazing. Wrot coper is exclusively used for fittings.

Metallogenic Geological Characteristics and Forecast for the liushanyan coper-zinc mine Deposite

Detremination of coper, Iron and Zinc in Suse by Flame Atomic Absorption spectrometry;

This paper, based on cointegration theory, empirically analyses the relation of future and present prices of coper in Shanghai market.