Such films _____ shown yesterday ______ not worth seeing again.

A．that was; is

B．as were; are

C．as were; is

D．those were; are

防雷建筑物引下线最少不应少于几根？各类防雷建筑物引下线间距各是多少米？引下线直径不应小于多少毫米？各类防雷建筑物冲击接地电阻不宜大于多少欧姆？