装饰工程按材料分类可分为( )。
A．陶瓷类
B．玻璃类
C．涂料类
D．保护装饰
E．饰面装饰
参考答案：A,B,C
Along with the letter was his promise _____ he would visit me this coming Christmas.
A．which
B．that
C．what
D．whether
焦油连续蒸馏的主要设备有管式炉、蒸发器和（）组成。
