用强夯处理渗透性系数差的黏性土地基，两遍夯的间隔时间为（）周。
A.1～2
B.2～3
C.3～4
D.4～5
参考答案：C
喷涂、滚涂、弹涂装饰抹灰面层的外观质量应颜色一致，花纹色点大小均匀，不显接槎，无漏涂、透底和流坠。( )
Two well-developed high pressure areas may be separated by a（）.
A.Hill of low pressure
B.Trough of low pressure
C.Valley of low pressure
D.Ridge of low pressure
