海船船员考试
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 t
题目
They should always be started with the discharge valve closed
They should always be started with the discharge valve opened
A priming pump is always required to flood the impeller suction
They should always be started with the sealing line valves closed
相似问题和答案
第1题：
Which of the following statements about ORACLE is (are) correct?
Ⅰ.ORACLE follows SQL standard
Ⅱ.ORACLE database defines two logical types: table and view
A．Ⅰonly
B．Ⅱ only
C．Ⅰ and Ⅱ
D．none of the above
第2题：
In HDLC Protocol, when Supervisory Frame's type code is '00'.About the following statements, which is correct.
A．Receive Ready
B．Receive not Ready
C．Reject
D．Selective Reject
第3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 only
B 1 and 3 only
C 1 and 2 only
D All three statements are correct
第4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.
正确答案:B,D
第5题：
Which of the following statements concerning intellectual property is wrong？（）
- A、Intellectual property is an intangible creation
- B、Intellectual property in ludes patents，trademarks，copyrights，etc.
- C、Intellectual property is a visible creation
- D、There are some agreement sconcerning intellectual property under the WTO
正确答案:C
第6题：
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.
第7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.
正确答案:A,B
第8题：
19 Which of the following statements about intangible assets in company financial statements are correct according
to 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 only
B 1 and 2 only
C 2 and 3 only
D All three statements are correct
第9题：
Which of the following statements concerning IGMP are correct？（Choose all that apply.）（）
- A、With IGMPvl， queries are sent to a specific group
- B、Hosts issuing IGMPvl requests will be correctly interpreted by IGMPv2 hosts due to backwardcompatibility
- C、An IGMPv2 router will ignore IGMPv2 leave messages when IGMFVl hosts are present
- D、With IGMFV2， a leave message is supported
- E、An IGMPv2 host will send an IGMFVl report on an IGMFVl router
- F、An IGMPv2 router can only allow IGMPv2 hosts to execute a join request
正确答案:C,D,E
第10题：
Energy can be created or destroyed
Energy may not be transformed
The total quantity of energy in the universe is always the same
None of the above