门窗框与墙体间的缝隙宜采用聚合物水泥防水砂浆或()填充。
参考答案:发泡聚氨酯
Having decided to rent a flat,we ________ contacting all the real estate agencies in the city.[ ]
A.set about
B.set down
C.set out
D.set up
消费者对产品的评价行为。