Which of the following statements regarding ISDN are correct?()
A. Each ISDN B channel has transmission speeds of up to 64 kbps.
B. The ISDN B channel can carry video, voice or data.
C. The ISDN B channel transmission rate varies depending on the service used.
D. The ISDN D channel transmits control information.
E. The ISDN B channels can be configured with different subnets and encapsulation types when dialer profiles are configured.
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不正确的采样,事后会很难察觉和检查,而且很难补救。
A. 正确
B. 错误
观看文艺演出或体育比赛时,为表热情,掌声越多越好。
A. 正确
B. 错误
信号联锁管理人员和试验人员必须经联锁试验资格培训,取得资格证后()上岗。
行政复议机关责令申请人重新作出具体行政行为的,被申请人()以同一的事实和理由作出与原具体行政行为相同或者基本相同的具体行政行为。
A. 不得
B. 可以
C. 应当