压力越高，自燃点越低；可燃气体中氧浓度越高，自燃点越高。（）
参考答案：错
Two lawyers have donated $50,000 to ________ our school’s campaign “Help the Needy”, which was started by our former headmaster three years ago.
A．sponsor
B．launch
C．organize
D．plan
通常所用的煤火方法有冷却法、窒息法、隔离法、控制法。（）
