衬里分为哪几类？各自的作用是什么？
参考答案：
1）隔热衬里：其保温作用，减少热量损失。
2）耐磨衬里：避免催化剂对器壁的冲刷磨损。
Because he is ______head of the government, he is supposed ______.
A．/; to taking
B．/; to take the lead
C．the; taking the
D．the; taking
若病理证实为宫颈鳞癌，进行临床分期常用、有效方法
A．双合诊
B．三合诊
C．肛腹诊
D． * * 窥视
E．腹腔镜
