__________I know the money is safe，I shall not worry about it.

A．Even though

B．Unless

C．As long as

D．While

20/5t桥式起重机连接线必须采用铜芯多股软线，采用多股单芯线时，截面积不小于（）。

A、1mm2

B、1.5mm

C、0.5mm

D、6mm2