( )是指燃油缓慢氧化而开始着火燃烧的温度。
A．自燃点 B．闪点 C．沸点 D．燃点
参考答案：A
Many young people are now crazy about Board Games (桌游), which are based on pure strategy and kind of of players’ psychological quality.
A．exchange
B．charge
C．challenge
D．preference
矩形ABCD的对角线AC、BD相交于O，如果△ABC的周长比△AOB的周长大10cm，则矩形边AD的长是( )。
A．5cm B．10cm C．7.5cm D．不能确定
