CRH1的电动机变流器模块(MCM)位于()内。 ["A、高压控制箱","B、滤波器箱","C、变流器箱","D、充电机箱"]
DWDM系统对于光纤性能,最关心的是哪个因素?() ["A、否支持SDH","B、物理接口","C、损耗","D、色散"]
瓷横担绝缘子安装,当直立安装时,顶端顺线路歪斜不应大于()mm。 ["10;","20;","25;","30。"]
SDH信号中AU4指针的有效取值范围是:() ["A、1-140","B、0-139","C、1-783","D、0-782"]
CRH1司机室操纵台上的停放制动状态指示灯闪烁表示()。 ["A、停放制动正在动作","B、停放制动被切除","C、停放制动未施加","D、停放制动已施加"]
堤身准位隐患的处理一般采用哪两种方法?