车钩防跳插销安装时，装有制动软管吊链的车辆，防跳插销可安装在制动软管吊链的第（）链环中。
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What are two characteristics of the relationship between the Cisco PIN architecture and Cisco Validated Designs? （）(Choose two.)
A. Cisco is focusing on Cisco Validated Designs as a means to driving integrated networks.
B. Cisco is focusing on the PIN architecture as a means to driving integrated networks.
C. The Cisco PIN architecture is a critical mechanism for supporting integrated markets because it can be implemented quickly.
D. The Cisco Validated Designs program provides critical mechanisms for supporting integrated markets because the mechanisms can be implemented quickly.
E. Cisco Validated Designs can be implemented quickly without customer input.
测试自动装置遥信量的变位响应时间，应不低于装置说明书中的技术指标的规定，一般不大于（）s。
A. 0.1
B. 1
C. 5
D. 10
已知一砖墙的隔声量为52dB，如果在其他条件不变的情况下将它的厚度减少一半，隔声量应为多少（）
A. 26dB
B. 46dB
C. 52dB
D. 42dB
配电线路通过果林、经济作物以及城市灌木林，不应砍伐通道，但导线至树梢的距离不应小于（）m。
A. 2
B. 2.5
C. 1
D. 1.5
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