We understand the challenges related to obtaining your certification in sonography and have created several tools to assist in your registry success. The website offers self study review courses, click to learn exams and mock registry exams to help you prepare for the ARDMS ® and CCI ® Registry Exams.

Union Railroad (reporting mark URR) is a Class III switching railroad located in Allegheny County in Western Pennsylvania. The company is owned by Transtar, Inc., which is a subsidiary of Fortress Transportation and Infrastructure Investors, after being acquired from U.S. Steel in 2021.

The EMD SW7 is a 1,200 horsepower diesel switcher locomotive built by General Motors Electro-Motive Division between October 1949 and January 1951. At 1,200 horsepower, the SW7 replaced the 1,000 horsepower NW2 in the EMD catalog.

From coach and freight yards to primary power for shortlines, the WalthersMainline SW7 is a perfect choice for your HO layout! Delivering 1200-horsepower from an updated 567A prime mover, the prototypes proved popular with both railroads and industrial lines, with nearly 500 produced from 1949 to 1951 with several still in service, each layout ...

Enter your user name and password when prompted. Online review products for Sonographers. Review courses with 1000s of digital images and challenging practice exams. Products available for Abdominal Sonography, OB/GYN Sonography, Vascular Sonography, Echocardiography and Sonography Principles and Instrumentation.

PRE-ORDER: Broadway Limited 9353 - EMD SW7 w/ DCC and Sound Union Railroad (URR) 705 - N Scale

2022年6月6日 · 图纸中常见到SW，它表示 Side Width，即对边宽度，有些国外图纸中会标注成WAF，各国标准对比如下：

EMD serial #s 10900-10999. 10900 to 10999: Serial # Built Date Order Number Model Road No. Road No. Road No.

A RG level URR may be linked to IP-CAN bearer level URR as well as IP-CAN Session level URR to enable the CP function to generate a CDR on the different level. In such case, a URR "X" may link to more URRs than just URR "Y". RG级URR可以链接到IP-CAN承载级URR以及IP-CAN会话级URR，以使CP功能能够在不同的级别上生成CDR。

2021年11月7日 · 不平衡量减少率（URR, Unbalance Reduction Ration). URR的定义为：“ 经过一次平衡校正减少的不平衡量与初始不平衡量的比值 ” 并且“此不平衡量减少率是应在假定增加和去除质量无误差，操作平衡机具有正常技能并细心的情况下给出” 。