对于正弦交流而言，t=O时的（）称为初相角或初相位。
A、相位
B、相位角
C、瞬时值
D、频率
参考答案：B
Justices of the peace have jurisdiction over the trials of some civil suits and of criminal cases involving minor offenses.
A．supremacy
B．authority
C．guidance
D．obedience
