British regulations are also being toughened.英國的規(guī)章也正在變得更加嚴(yán)格。You can crack this toughened glass, but you can't break it.這種韌化玻璃只裂不碎.Only by taking part in practice can the young people be toughened and hardened into s...
The silica powder toughened is an electrician filler of toughness epoxy for epikote developing.增韌硅微粉是為增韌環(huán)氧樹脂而研制開發(fā)的一種電工級(jí)專用填料.Only by taking part in practice can the young people be toughened and hardened into steel.年輕人只有通...