蒸压加气混凝土砌块与普通烧结砖相比，其特点是自重轻。（）
参考答案：对
Einstein’s Theory of Relativity was so __________that few people could understand it at that time.
A．controversial
B．religious
C．abstract
D．contradictory
鲜奶、鲜果汁、一般使用（）陈列工具
A.墙面及柱子陈列
B.柜台陈列
C.冷藏柜陈列
D.正常货架陈列
