A-B站区间发生行车事故,需要从A站的前方站C站派遣救援列车,救援列车由c站出发的行车凭证为()。
A、出站信号机
B、调度命令
C、路票
D、原行车凭证
参考答案:D
如下图所示,电源电压不变,灯L的电阻为20Ω,当滑动变阻器滑片P位于中点时,电压表的示数为2V,电流表的示数为0.2A,当滑片位于变阻器最右端时,电压表的示数为:
A.3V
B.4V
C.6V
D.8V
根据下列句子及所给汉语注释,写出空缺处各单词的正确形式,每空只写一词。
小题1:His life became much more difficult after his father’s ________(死).
小题2:Is he able to __________(提供)us with some useful information.
小题3:After having a picnic, all of us felt tired and_________(困倦的)
小题4:Sun Yang was on world record pace in the ________(最终的) 50 meters and broke the Olympic record.
小题5:Two________(渔民)died in the river yesterday.