沥青复合胎柔性防水卷材上表面材料不宜使用聚酯膜,聚酯镀铝膜;下表面材料采用聚乙烯膜或细砂,不应使用()。
A.矿物粒料
B.聚酯膜
C.聚乙烯膜
D.细砂
参考答案:B
— Well, where did you spend your night that day?
— At __________. [ ]
A. where it is called Grand Hotel
B. what is called Grand Hotel
C. which is called Grand Hotel
D. that is called Grand Hotel
关于多媒体的描述中,错误的是( )
A.多媒体的数据量很大,必须进行压缩才能实用
B.多媒体信息有许多冗余,这是进行压缩的基础
C.信息熵编码法提供了无损压缩
D.常用的预测编码是变换编码