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单选题
A large metallic device，mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)，designed to prevent the passage of a rapidly moving flame through the piping is called a（）.
A
flame arrestor
B
flame screen
C
detonation arrestor
D
detonation blocker
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更多 “单选题A large metallic device，mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)，designed to prevent the passage of a rapidly moving flame through the piping is called a（）.A flame arrestorB flame screenC detonation arrestorD detonation blocker” 相关考题
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()is very fast storage used to hold data.It connects directly to the microprocessor.
A.CPUB.MemoryC.DiskD.I/0 device
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A large metallic device，mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)，designed to prevent the passage of a rapidly moving flame through the piping is called a ______.A.flame arrestorB.flame screenC.detonation arrestorD.detonation blocker
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Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）A、the FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central officeB、the FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial toneC、the FXS interface connect directly to an IP phone and supplies ring， voltage， and dial toneD、the FXS interface connect directly to ISDN voice channels
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Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）A、The FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office.B、The FXS interface connects directly to a standard telephone，fax machine，or similar device and supplies ring，voltage，and dial tone.C、The FXS interface connects directly to an IP phone and supplies ring，voltage，and dial tone.D、The FXS interface connects directly to ISDN voice channels.
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A company is installing IP phones. The phones and office computers connect to the same device. To ensure maximum throughput for the phone data, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic. What is the best network device to which to directly connect the phones and computers, and what technology should be implemented on this device? (Choose two.)（）A、hubB、routerC、switchD、STPE、subinterfacesF、VLAN
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Which statement describes the distributed call control model in VoIP networks？（）A、The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardownB、The gateway voice-capable device has a local call routing table configured through a routing protocol.C、The gateway voice-capable device relies on a call agent to support call control.D、The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.
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A company is installing IP phones. The phones and office computers connect to the same devicE.To ensure maximum throughput for the phone data, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffiC.What is the best network device to which to directly connect the phones and computers, and what technology should be implemented on this device? （）A、hubB、routerC、switchD、STPE、subinterfacesF、VLAN
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Which of the following is a bus mastering method？（）A、 A device transfers data directly to the memory.B、 A device handles mediation between the northbridge and the processor.C、 A device connects to another device without involving the processor.D、 A device transfers data to the processor and then on to the memory.E、 A device handles mediation between the southbridge and the processor.
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单选题If you must land on a beach with an oar-propelled lifeboat through a heavy surf，the recommended method is to（）.A
keep the bow directly in toward the beach，and tow the sea anchor off the sternB
ride in on the back of a large breakerC
keep the bow into the seas with the sea anchor out over the bow，and row to meet the breaking wavesD
head directly into the beach by staying between the crests of the waves
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单选题A multistage centrifugal pump can be BEST described as having （）.A
two or more impellers housed together in one casing and mounted on a single shaftB
a single stepped impeller mounted in a progressively staged casingC
a large radial clearance between the impeller and casing to prevent overheating due toD
an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
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hoisting cargo aboard a vesselB
hoisting personnel aboard a vesselC
securing a small boat to a large vesselD
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raw metallic productsB
finished metallic productsC
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单选题A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.A
cylinder headsB
exhaust valvesC
scavenging airD
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考题
多选题Which of the following is a bus mastering method?（）AA device transfers data directly to the memory.BA device handles mediation between the northbridge and the processor.CA device connects to another device without involving the processor.DA device transfers data to the processor and then on to the memory.EA device handles mediation between the southbridge and the processor
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单选题（）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.A
fragile or expensive cargoesB
raw materialsC
finished metallic productsD
manufactured goods of large size
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单选题Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）A
the FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central officeB
the FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial toneC
the FXS interface connect directly to an IP phone and supplies ring， voltage， and dial toneD
the FXS interface connect directly to ISDN voice channels
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单选题（） is (are) not power supplied by main switchboard directly.A
Steering gear and windlassB
Navigation light and radio power panelC
Navigation device power boxD
Daily fresh water pump
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单选题The discharge head of a centrifugal pump will vary directly with the （）.A
change in impeller diameterB
square of the impeller diameterC
cube of the impeller diameterD
impeller efficiency for large changes in the size of the impeller
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单选题The discharge rate or capacity of a centrifugal pump will vary directly as the （）.A
change in the impeller diameterB
square of the impeller radiusC
cube of the impeller diameterD
impeller efficiency for large changes in its size
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单选题Which statement describes the distributed call control model in VoIP networks？（）A
The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardownB
The gateway voice-capable device has a local call routing table configured through a routing protocol.C
The gateway voice-capable device relies on a call agent to support call control.D
The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.
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单选题The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.A
large conical springsB
compressed air pressureC
hydraulic pressureD
exhaust gas pressure
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