PURPOSE:To manufacture the lightweight Al-Be-Li-Cu-Mg alloy having high strength and high ductility by incorporating specified ratios of Li, Cu, Mg, Zr and Be into Al. CONSTITUTION:The Al-Be-Li-Cu-Mg alloy contg., by weight, 1.00 to 4.00% Li, 0.05 to 2.50% Cu, 0.05 to 1.80% Mg...
参考答案: D 复制 纠错举一反三 瓶阀与阀座的螺纹连接应密封,密封材料应与液化石油气介质不相容。() A. 正确 B. 错误 查看完整题目与答案 使用液化气钢瓶时,瓶上常挂“水珠”,用量过大,气化速度太快,液化气钢瓶还有可能结霜。() A. 正确 B. 错误 查看完整题目与答案 液化石油...