Benzer spent over a year tinkering with germanium until he discovered that mixing in trace elements of tin could produce rectifiers that were ten times more resistant than was standard.
An investigation by RFE/RL’s Schemes has found that companies at least partially owned by the Chinese state are feeding ...
BANGKOK (AP) — China announced Tuesday it is banning exports to the United States of gallium, germanium, antimony and other key high-tech materials with potential military applications ...
当前正在显示可能无法访问的结果。
隐藏无法访问的结果