受力特点为中央弯矩大于四边弯矩,受力变形成锅底状的为( )板。
A.单向
B.双向
C.两边支承
D.一边固定,三边自由
参考答案:B
Taking a car is always ______ than ______ a bus. [ ]
A. faster, take
B. fast, to take
C. faster, taking
D. more faster, taking
下列不属于城市防洪设施的是( )。
A.行洪区
B.截洪沟
C.排涝泵站
D.排洪沟