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磁感应强度B，磁场强度H，磁通密度φ，它们的单位名称和符号在CGS制中依次分别是（），（），（）

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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。

A. 1个
B. 2个
C. 3个
D. 4个

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.

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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

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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

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