当变压器油温升高时,测温探头的电阻阻值()。
A.变大
B.变小
C.不变
参考答案:A
互感器二次接地属于()
A.工作接地
B.母线接地
C.保护接地
Which of the following is NOT a type of phytoplankton
A.Green algae.
B.Diatoms.
C.Blue-green algae.
D.Amoeba.