A、A.a 30 second on 30 second off alternating signal
B、B.the continuous blast of the ships whistle for not less than 10 seconds supplemented by the continuous ringing of the general alarm bells for not less than 10 seconds
C、C.an intermittent ringing of the general alarm for not less than ten seconds
D、D.announced over the PA system
更多“The signal for a fire emergency on an OSV is（）.”相关的问题
A、A. Establishing a signaling channel between two signaling entities in an ATM network B、B. Provide reliable connection for signaling between two IP signaling nodes C、C. Provide routing for IP signaling messages in an IP signaling network
A、A.More than six short blasts and one long blast on the whistle B、B.Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm C、C.Three short blasts of the whistle supplemented by the same signal on the general alarm D、D.More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm
A、the signal to noise of the current optical amplifier B、the signal to noise of the previous amplifier or source C、the signal to noise introduced by the optical multiplexer D、the accumulated noise to signal ratio of the optical channel
A、When at anchor，the pilot vessel is only required to sound anchor signals B、The identification signal must be sounded any time the pilot vessel is underway C、The pilot vessel may only sound the identity signal when making way D、All of the above
A、white lights are not used B、red and green lights are not used C、the signal cannot be mistaken for a signal authorized by the Rules D、the vessel signals such intentions over the radiotelephone
A、A. Channel-associated signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream. B、B. Channel-associated signaling utilizes a separate TDM channel for transmitting control signals. C、C. Common channel signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream. D、D. Common channel signaling uses one of the TDM channels to transmit control information reducing the number of channels available for voice. E、E. ISDN BRIs implement channel-associated signaling.
A、Each fiber has half of its SONET capacity reserved for protection. B、Two fibers in the span carry working traffic, while the other two fibers in the span are reserved for protection. C、The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality. D、The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.
A、A.Less signal energy is necessary for receiver operation B、B.More signal energy is available at the receiver C、C.It significantly increases the peak power D、D.It increases the signal capacity
A、-40dBm signal and -90dBm noise B、-50dBm signal and -90dBm noise C、-30dBm signal and -90dBm noise D、-20dBm signal and -90dBm noise
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