单选题:下列关于钢筋混凝土连续梁、板的受力特点,叙述正确的是(  )。

题目内容:
下列关于钢筋混凝土连续梁、板的受力特点,叙述正确的是(  )。 A.跨中有负弯矩
B.支座有正弯矩
C.跨中按最大正弯矩计算正筋
D.支座按最大负弯矩计算正筋

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答案解析:

对于暂时不能开工的建设用地,建设单位应该对裸露地面进行覆盖,超过一定时间的,应该进行绿化、铺装或者遮盖。该时间限定为( 

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