铁路保价运输是铁路运输实行（）后，为保证托运人、收货人合法权益，供托运人选择的一种赔偿制度。
A. 声明价格
B. 限额赔偿
C. 有限赔偿
D. 比例赔偿
若谐振功率放大器原来工作在临界状态，只增加Vcc，其它电路参数不变，则放大器工作状态将如何变化？
Which statement about Software Maintenance Upgrade is true？（）
A. CRS-1 SMU can be applied to a different platform， and vice versa
B. SMU is an executable code for running a process or libraries that are shared between the different processes
C. SMUs for each release are individually downloadable from Cisco.com and come in the form of a tar ball
D. SMUs provide software fixes for critical network down and qualification blocking issues Therefore，every software defect has a corresponding SMU
E. SMUs are release-specific. If an issue affects multiple platforms or releases，an SMU is built separately for each release and each platform
肾盂肾炎血行感染最先侵犯的部分是（）
A. 肾盂
B. 近端肾小管
C. 远端肾小管
D. 肾皮质
E. 肾乳头
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