exist名词

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• 在SQL语句中，谓词“EXISTS”的含义是（）

  A . 全程量词 B . 存在量词 C . 自然连接 D . 等值连接

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• The following routes exist in the Testking router（）

  A . R 12.18.8.0/24 [120/1] via 12.18.2., 00:00:10, Serial0 B . R 12.18.11.0/24 [120/7] via 12.18.9.1, 00:00:03, Serial1 C . C 12.18.1.0/24 is directly connected, Ethernet0 D . R 12.18.5.0/24 [120/15] via 12.18.2.2, 00:00:10, Serial0

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• Which syntax turns an existing constraint on?（）

  A . ALTER TABLE table_name ENABLE constraint_name; B . ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint_name; C . ALTER TABLE table_name ENABLE CONSTRAINT constraint_name; D . ALTER TABLE table_name STATUS ENABLE CONSTRAINT constraint_name; E . ALTER TABLE table_name TURN ON CONSTRAINT constraint_name

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• Risk of collision may be deemed to exist（）.

  A . if the compass bearing of an approaching vessel does not appreciably change B . even when an appreciable bearing change is evident, particularly when approaching a vessel at close range C . if you observe both sidelights of a vessel ahead for an extended period of time D . All of the above

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• For existing ships，（）is not an improvement to safety.

  A . the reinforcement of the aft transverse watertight bulkhead B . the double bottom structure in way of the foremost cargo hold C . the introduction of a more rigorous survey regime and greater attention to operating procedures D . introduction of new and improved desig

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• When a vessel is in any doubt as to whether such a situation exists she shall（）that it does exist and act accordingly.

  A . consume B . assume C . perfume D . resume

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• A customer wants to migrate their existing compute-intensive POWER6 570 to a Power 770. Which of their existing I/O adapters can be migrated to Power 770 enclosures?（）

  A . PCIe adapters B . PCI-X adapters C . PCI-X and PCIe adapters D . PCI, PCI-X and PCIe adapter

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• If a large difference exists between the compressor discharge pressure and the pressure corresponding to the existing condensing temperature in a refrigeration system, you should（）.

  A . increase the flow of the cooling water through the condenser B . adjust the high pressure cutout to maintain the desired pressure C . open the hot gas bypass temporarily to reduce capacity D . purge non-condensable gases to reduce the excess pressure

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• Given that a scoped attribute cart exist only in a user’s session， which two， taken independently， ensure the scoped attribute cart no longer exists？（）

  A .  ${cart = null }  B .  <c：remove var=”cart” />  C .  <c：remove var=”${cart}” />  D .  <c：remove var=”cart” scope=”session” />  E .  <c：remove scope=”session”>cart</c：remove> F .  <c：remove var=”${cart}” scope=”session” />  G .  <c：remove scope=”session”>${cart}</c：remove&gt

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• Company network is implemting IPv6 into their existing IPv4 netwrok. Which statement is trueabout incorporating IPv6 into an already existing IPv4 network？（）

  A . Only OSPF version 3 can be utilized for routing IPv4 and IPv6 B . IPv4 and IPv6 networks can be routed simultaneously C . IPv6 can be routed using the same routing protocol versions as IPv4 D . A router routing for IPv6 and IPv4 must convert IPv4 packets to IPv6 packets to route them E . None of the other alternatives apply

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• Which syntax turns an existing constraint on? （）

  A . ALTER TABLE table_name ENABLE constraint_name; B . ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint _ name; C . ALTER TABLE table_name ENABLE CONSTRAINT constraint _ name; D . ALTER TABLE table_name TURN ON CONSTRAINT constraint _ name

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• Which capability exists only in java.io.BufferedWriter？（）

  A . Closing an open stream. B . Flushing an open stream. C . Writing to an open stream. D . Writing a line separator to an open stream.

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• Given that a scoped attribute cart exists only in a user’s session， which two， taken independently， ensure the scoped attribute cart no longer exists？（）

  A .

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• A customer wants to migrate their existing compute-intensive POWER6 570 to a Power 770. Which of their existing I/O adapters can be migrated to Power 770 enclosures?（）

  A . PCIe adapters B . PCI-X adapters C . PCI-X andPCIe adapters D . PCI, PCI-X andPCIe adapter

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• When you doubt the existence of risk of collision,（）.

  A . such risk shall be deemed to exist B . Such risk shall not be deemed to exist C . You should keep your course and speed D . You needn‟t take any action to avoid collision with any vessel

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• The Red Cross exists in almost every country the world?

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• “being”是所存在的世界，“exist”是所什么的世界。

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• The advantages of existing channels includes ( )

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• Risk of collision may exist ______.

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• When Julius CaesarBritain in 55 B.C., English did not exist.

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• How do GM foods exist in European countries at present？

  A．European countries forbid GM foods imported from America and Canada. B．A11 the GM foods are labeled and could be traced to the origins. C．There is no market for GM foods in European countries. D．GM foods are quite popular in European countries but with labels and traceability.

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• Which type of router cannot exist within a stub area？（）

  <img src='https://img2.soutiyun.com/shangxueba/ask/64164001-64167000/64165366/4efb7c69cfb707363182855d10093731.jpg' /> A．A B．B C．C D．D

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• 68、谓词EXISTS可用来测试一个集合是否有重复元组。

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• The records （） to show an improvement in sales thatdidn’t exist.

  A．were pretended B．were pretending C．were faked D．were lied

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