______ the local authorities put more attention to the safety of the children, more than 20 lives __________ in Gansu Province.

A．Should, would not be claimed

B．Had, would not have been claimed

C．Should, would not be cost

D．Had, would not have been cost

配电线路的导线截面宜按（）选择。

A.允许载流量

〔B.允许电压降

C.机械强度

D.设计安全系数