超出有效范围的燃烧称为（）。
A．闪燃
B．自燃
C．火灾
D．着火
参考答案：C
简述PAP认证方式和CHAP认证方式的区别。
In a Han Dynasty tomb, they found some precious jars and vases, _______ are valuable.
A．even the pieces of them
B．which even pieces
C．even the pieces of which
D．that even pieces
