以下是NK保护膜常见的不良缺陷（）。
A.鱼眼
B.铣痕
C.裂纹
D.以上均不是
参考答案：A
25. For many cities in the world, there is no room to spread out further, _____New York is an example.
A．for which
B．in which
C．of which
D．from which
《高层民用建筑设计防火规范》规定，高层建筑窗槛墙、窗间墙的填充材料应采用（）材料
A.不燃烧
B.难燃烧
C.可燃烧
D.易燃烧
