在生产实践中理论回收率与实际回收率的差值（）越好。
A. 越大
B. 越小
C. 相等
D. 以上都对
由于点火线圈次级电压的高低与初级电流大小有关，所以如果初级电流越大，则感应生成的次级电压也就越高。
A. 正确
B. 错误
Which statement best describes the Cisco 2700 Location Appliance collection of location information for wireless devices?（）
A. all Wi-Fi devices on the WLAN send directly received signal strength indication （RSSI） information to the Cisco Wireless Location Appliance through SNMP
B. an AP collects RSSI information which is forwarded to wireless controllers through LWAPWireless controllers forward aggregated RSSI to the location appliance through SNMP
C. the APs collect received signal strength indication （RSSI） information from all Wi-Fi devices and forward the information to the Cisco Wireless Location Appliance through the LWAPP
D. the Cisco WLAN controllers bypass the received signal strength indication （RSSI） information from all Wi-Fi devices to the Cisco Wireless Location Appliance through the LWAPP
变造的货币是指在（）的基础上，利用（）、（）、涂改、拼凑、移位、重印等多种方法制作，改变（）原形态的假币。
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