不影响阳极消耗速度的是（）。

A、电解温度

B、阳极质量

C、电流强度

D、氧化铝浓度

Cargo vessels being navigated，and fitted with emergency lighting and power systems，shall have their emergency systems tested at least once（）.

A.a month

B.in each week

C.in every 6 months

D.in every 12 months