[单选] In order to improve the efficiency of the communication with shore personnel, you should（）
A . inform the chief engineer whenever there are problems B . reduce the time wasted on checking items C . know who is responsible for the domestic cleaning equipment D . know the chain of authority on the shi
CRH2不管哪一侧与其他编组的CRH2的都可以联挂。
读下图，回答下列问题。
家在荔湾区的小明感觉天气一天比一天寒冷，夜色也一天比一天更早地降临了，此日地球运行的位置在（） ①→②。 ②→③。 ③→④。 ④→①。
耐雪制动是为了防止由于闸片和制动盘面之间的积雪而引起制动力降低。
质量教育的作用是什么？
CRH2A型动车组外端墙上安装有气密式外风挡、压缩形内风挡和防雪风挡等。
In order to improve the efficiency of the communication with shore personnel, you should（）
