桅杆在使用时，严禁在（）级以上的风速下进行吊装。
A、4
B、5
C、6
D、7
参考答案：C
-Would you mind my coming over and having a look at your new garden?My little son’s
curious about those roses you grow.
- .You’re welcome.
A.Yes,I do
B.Never mind
C.Yes,please
D.Not at all
特殊土地基主要包括哪几类,具有何种工程特性？
