警冲标是确定机车车辆停车位置，保证行车安全的信号标志之一，安装位置在道岔（）。
A、前部
B、中部
C、后部
D、背部
参考答案：C
《白鹿原》在叙事结构和视角上有哪些特点？
Multipurpose Internet Mail Extension (MIME) is a (46) document messaging standard in the Internet enviroment, with MIME, users can send (47) Email messages that include audio, video, graph-ices, and text to any other user of a TCP/IP network. Richtext information can also be (48) into messages. It defines the fonts, formats, and (49) features of a document so the document can be easily (50) on many different types of systems.
A．incorporated
B．filled
C．stored
D．flied
