广播控制台的控制信号通过（）与广播设备柜连接，音频信号通过（）广播设备柜连接。
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有动态记录的健康档案是指（）年内有符合各项服务规范要求的相关服务记录的健康档案
A. 1
B. 2
C. 3
D. 1.5
According to regulations，a cargo hose used for transferring liquefied gases must have a bursting pressure of（）.
A. 5 times the maximum working pressure on the hose during cargo transfer
B. one half the designed working pressure
C. 4 times the pressure of the cargo pump used for transferring
D. 5 times the minimum working pressure on the hose during cargo transfer
垄断竞争条件下资源配置效率不如完全竞争的原因在于产品差别的存在。
A. 正确
B. 错误
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