CFG桩施工中,每台班均须制作检查试件,进行()强度检验。成桩()后应及时进行单桩承载力和()承载力试验,其承载力、变形模量应符合设计要求。
参考答案:28d;28d;复合地基
40分∶2小时=20∶1。[ ]
. As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.
A.primary
B.alternative
C.instant
D.Unique