A、If the first stand-by set failed
B、If the first stand-by set fails
C、If the first stand-by set will fail
D、If the first stand-by set doesn’t fail
更多“（）, the second one will start automatically.”相关的问题
A、one-millionth part of a second B、one-thousandth part of a second C、one-hundredth part of a second D、one-tenth part of a second
A、A.SOS sent three times B、B.ten one-second dashes with a four-second interval between them C、C.twelve four-second dashes with a one-second interval between them D、D.twelve one-second dashes with a short interval between them
A、one blast，4 to 6 seconds in duration B、three blasts，4 to 6 seconds in duration C、one continuous blast until you are able to see around the bend D、one blast，8 to 10 seconds in duration
A、A.28 seconds；7 knots B、B.28 seconds；14 knots C、C.60 seconds；7 knots D、D.60 seconds；14 knots
A、a continuous ringing for 10 seconds B、one short ring followed by one long ring C、two long rings of at least 20 seconds D、a continuous ringing until the fire is extinguished
A、a continuous ringing for 10 seconds B、one short ring followed by one long ring C、two long rings of at least 20 seconds D、a continuous ringing until the fire is extinguished
A、more than 28 seconds B、more than 60 seconds C、less than 28 seconds D、less than 60 seconds
A、A rapid ringing of a bell for 5 seconds every two minutes B、A whistle signal of one short，one prolonged，and one short blast C、A prolonged blast of the whistle at intervals not to exceed one minute D、A rapid ringing of a bell for 5 seconds，preceded and followed by three separate and distinct strokes on the bell
A、Put one line at the low point and one at the high point of the bollard so they don't touch B、Take the eye of the second line up through the eye of the first line before putting the second line on the bollard C、Never put two mooring lines on the same bollard D、The mooring line forward should be put on the bollard first
A、Utilizing Cisco NSF in Layer 2 environments can reduce outages to one to three seconds. B、Utilizing SSO in Layer 3 environments can reduce outages to one to three seconds. C、Distribution switches are single points of failure causing outages for the end devices. D、Utilizing Cisco NSF and SSO in a Layer 2 environment can reduce outages to less than one second. E、NSF and SSO with redundant supervisors have the most impact on outages at the access layer.
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