网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
Which of the listed statements is correct concerning the starting of centrifugal pumps?（）
A
They should always be started with the discharge valve closed
B
They should always be started with the discharge valve opened
C
A priming pump is always required to flood the impeller suction
D
They should always be started with the sealing line valves closed
参考答案
参考解析
解析：
暂无解析
更多 “单选题Which of the listed statements is correct concerning the starting of centrifugal pumps?（）A They should always be started with the discharge valve closedB They should always be started with the discharge valve openedC A priming pump is always required to flood the impeller suctionD They should always be started with the sealing line valves closed” 相关考题
考题
15 Which of the following statements about intangible assets are correct?1 If certain criteria are met, research expenditure must be recognised as an intangible asset.2 Goodwill may not be revalued upwards.3 Internally generated goodwill should not be capitalised.A 2 and 3 onlyB 1 and 3 onlyC 1 and 2 onlyD All three statements are correct
考题
19 Which of the following statements about intangible assets in company financial statements are correct accordingto international accounting standards?1 Internally generated goodwill should not be capitalised.2 Purchased goodwill should normally be amortised through the income statement.3 Development expenditure must be capitalised if certain conditions are met.A 1 and 3 onlyB 1 and 2 onlyC 2 and 3 onlyD All three statements are correct
考题
Which of the following statements about ORACLE is (are) correct?Ⅰ.ORACLE follows SQL standardⅡ.ORACLE database defines two logical types: table and viewA．ⅠonlyB．Ⅱ onlyC．Ⅰ and ⅡD．none of the above
考题
Which two statements are correct concerning DHCP Internal Server and DHCP External Server in the E－series router? ()(Choose two.)
A. They provide dynamic IP addresses for DSIs.B. They provide dynamic IP addresses for SRC applications.C. They provide dynamic IP addresses from pools for PPPoE subscribers.D. They provide dynamic IP addresses from pools for Routed IP subscribers.
考题
In HDLC Protocol, when Supervisory Frame's type code is '00'.About the following statements, which is correct.A．Receive ReadyB．Receive not ReadyC．RejectD．Selective Reject
考题
Which two statements are correct concerning DHCP Internal Server and DHCP External Server in the E-series router? （）(Choose two.)A、They provide dynamic IP addresses for DSIs.B、They provide dynamic IP addresses for SRC applications.C、They provide dynamic IP addresses from pools for PPPoE subscribers.D、They provide dynamic IP addresses from pools for Routed IP subscribers.
考题
Which of the following statements concerning intellectual property is wrong？（）A、Intellectual property is an intangible creationB、Intellectual property in ludes patents，trademarks，copyrights，etc.C、Intellectual property is a visible creationD、There are some agreement sconcerning intellectual property under the WTO
考题
Which of the following statements concerning IGMP are correct？（Choose all that apply.）（）A、With IGMPvl， queries are sent to a specific groupB、Hosts issuing IGMPvl requests will be correctly interpreted by IGMPv2 hosts due to backwardcompatibilityC、An IGMPv2 router will ignore IGMPv2 leave messages when IGMFVl hosts are presentD、With IGMFV2， a leave message is supportedE、An IGMPv2 host will send an IGMFVl report on an IGMFVl routerF、An IGMPv2 router can only allow IGMPv2 hosts to execute a join request
考题
Which statements are true concerning NAT？ （）A、 NAT provides 1 to manyaddress mapping.B、 NAT provides 1 to 1 address mapping.C、 NAT is only useful forTCP/UDP and ICMP traffic.D、 NAT can be used for all IP traffic.
考题
单选题Which of the following statements concerning energy is correct?（）A
Energy can be created or destroyedB
Energy may not be transformedC
The total quantity of energy in the universe is always the sameD
None of the above
考题
多选题Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)Ac=dBl and k are parallelCm and l are perpendicular
考题
单选题Which of the following statements concerning cargo is correct?（）A
Cargoes are any type of goods transported by any type of shipsB
Cargoes are goods transported in bulkC
Cargoes usually include goods transported in bulk and in containersD
Cargoes are usually packaged in containers
考题
单选题Which of the following statements concerning butterfly valves is correct?（）A
Special tools are required for lapping or grindingB
It is impossible to throttle flow with a butterfly valveC
To close the valve, it is only necessary to turn the handle a quarter of a turnD
The butterfly valve should never be used in a freshwater system
考题
多选题Which two statements are correct concerning DHCP Internal Server and DHCP External Server in the E-series router? （）(Choose two.)AThey provide dynamic IP addresses for DSIs.BThey provide dynamic IP addresses for SRC applications.CThey provide dynamic IP addresses from pools for PPPoE subscribers.DThey provide dynamic IP addresses from pools for Routed IP subscribers.
考题
单选题Which of the statements listed concerning heat transfer is correct?（）A
Heat is always transferred at a constant rateB
Heat transfer rate increases as temperature difference increasesC
The rate of heat transfer is not affected by temperature differenceD
The high temperature region is known as a heat sink
考题
单选题Which of the following statements is correct concerning heat transfer?（）A
Heat is given off from a high temperature region known as a heat sinkB
Heat transfer rate is affected most by the size of the heat sink involvedC
Heat transfer rate is affected most by the temperature difference between the heat source and the heat sinkD
Heat transfer by radiation will occur only by mass motion of a fluid substance
考题
单选题Which of the following statements is true concerning centrifugal pumps?（）A
They are particularly suited for pumping high viscosity fluidsB
They are started with the discharge valve openedC
The flow of liquid is developed by imparting energy due to the rotation of an impellerD
They are always mounted in a horizontal position
考题
单选题Which of the following statements is true concerning any evaporator?（）A
High conductivity of the distillate indicates distillate salinity is excessiveB
Increasing the absolute pressure of the shell will increase the distillers capacityC
Mesh separators are used in evaporators to filter the distillateD
Reducing the brine density will reduce the heat lost overboard
考题
单选题Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）A
The liquid receiver functions to collect and remove non-condensable gasesB
A thermostatic expansion valve is used to control refrigerated space temperatureC
Refrigerant temperature in an evaporator is directly related to refrigerant pressureD
Dehydrators must be used continuously in a refrigeration system
考题
单选题Which of the following statements concerning intellectual property is wrong？（）A
Intellectual property is an intangible creationB
Intellectual property in ludes patents，trademarks，copyrights，etc.C
Intellectual property is a visible creationD
There are some agreement sconcerning intellectual property under the WTO
考题
单选题Which of the following statements concerning fire-tube boilers is correct?（）A
Combustion gases flow through the tubesB
Flames impinge on the tubesC
Combustion occurs in the tubesD
Water flows through the tubes
考题
单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）A
It is lower than the ignition temperatureB
It is the temperature at which a substance will spontaneously igniteC
It is the temperature at which a substance, when ignited, will continue to bumD
It is the temperature at which the released vapors will fall within the explosive range
考题
多选题Which two statements are correct concerning DHCP Internal Server in the E-series router？（）AProvide dynamic IPaddressesforDSIs.BProvide connectivity to DHCP servers on other subnetworks.CProvide dynamic IP addresses for SRC applications.DProvide dynamic IP addresses from pools used for PPPoE subscribers.
考题
单选题Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）A
The greater the atomization, the greater the penetrationB
The greater the atomization, the less the penetrationC
The degree of atomization has nothing to do with the degree of penetrationD
Atomization and penetration are one and the same
考题
单选题Which of the listed statements is correct concerning refrigeration systems?（）A
Dehydrators must be used continuously in a refrigeration systemB
A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hoursC
A thermostatic expansion valve is used to control refrigerated space temperatureD
The liquid receiver functions to collect and remove non- condensable gases
考题
多选题Which of the following statements concerning IGMP are correct？（Choose all that apply.）（）AWith IGMPvl， queries are sent to a specific groupBHosts issuing IGMPvl requests will be correctly interpreted by IGMPv2 hosts due to backwardcompatibilityCAn IGMPv2 router will ignore IGMPv2 leave messages when IGMFVl hosts are presentDWith IGMFV2， a leave message is supportedEAn IGMPv2 host will send an IGMFVl report on an IGMFVl routerFAn IGMPv2 router can only allow IGMPv2 hosts to execute a join request
考题
单选题Which of the following statements is correct concerning the viscosity of lubricating oil?（）A
Viscosity will increase as temperature increasesB
Viscosity is a measure of a fluid s internal resistance to flowC
Viscosity will decrease as temperature decreasesD
Viscosity is not dependent on temperature
热门标签
最新试卷
