关于相电流概念的叙述，正确的是（）的电流。
A、流过头尾之间
B、相与相之间
C、流过各相端线
D、流过每相电源或负载
参考答案：D
The movie that the less famous director enjoyed a great success at the internation film festival, ______,of course, was beyond his wildest dream.
A．which
B．that
C．where
D．what
汞接触者尿汞升高的意义是
A．急性汞中毒诊断指标
B．慢性汞中毒诊断指标
C．汞吸收障碍
D．汞吸收指标
E．尿汞排泄障碍
