套管相对电容量比值正常值为（）。
A.初值差≤10%
B.初值差≤5%
C.初值差≤7%
D.初值差≤8%
参考答案：B
墙体中，钢筋混凝土圈梁通常设在( )处。
A．每层楼板
B．窗台下
C．屋顶屋面板
D．基础顶
E．女儿墙顶
It is not as difficult to store information as it is to ______ it quickly when it is wanted again.
A. represent B. retain C. restore D. retrieve
