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A port ______ if more than ordinary prudence and skill is needed to avoid exposure to danger there．
A.safety
B.is safe
C.is not safe
D.is not safety
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根据以下材料，回答
Using a computer or smartphone at nightcan cause us to 11 on the pounds, new research has revealed.
The study found a link between blue light 12 --blue light is 13 by smartphones and tables--and increasedhunger. It found that exposure to the light increases hunger levels for severalhours and even increases hunger levels 14 eating a meal.
Results of the US study show thatblue-enriched light exposure, compared with 15 light exposure, was 16 with an increase in hunger that began 15minutes after light onset and was still present almost two hours after themeal. Blue light exposure has also already been shown to decreased 17 in the evening, increasing the risk ofinsomnia.
Study co-author Ivy Cheung, of NorthwesternUniversity in Chicago, said, "A single three-hour exposure toblue-enriched light in the evening 18 impacted hunger andglucose metabolism." "These results are important because theysuggest that 19 environmental light exposure for humansmay represent a novel 20 of influencing food intake patterns andmetabolism."
The study group 21 10 healthy adults with regular sleep and eating schedules who received
22 carbohydrate-rich meals. They completed afour-day trial 23 dim light conditions, which involvedexposure to less than 20 lux during 16 hours 24 and less than three lux duringeight hours of sleep. On day three they were exposed to three hours of 260 lux,blue-enriched light starting 10.5 hours after waking up, and the effects werecompared with dim light exposure on day two.
Ms Cheung said more research is needed todetermine the 25 of action involved in the relationshipbetween light exposure, hunger and metabolism.A.touch
B.exposure
C.contact
D.approach
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A switch is configured with all ports assigned to vlan 2 with full duplex FastEthernet to segment existing departmental traffic. What is the effect of adding switch ports to a new VLAN on the switch?（）A、More collision domains will be created.B、IP address utilization will be more efficient.C、More bandwidth will be required than was needed previously.D、An additional broadcast domain will be created.
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When you enable port security on an interface that is also configured with a voice VLAN， what is the maximum number of secure MAC addresses that should be set on the port？（）A、No more than one secure MAC address should be set.B、The default will be set.C、The IP phone should use a dedicated port， therefore only one MAC address is needed per port.D、No value is needed if the switchport priority extend command is configured. E、No more than two secure MAC addresses should be set.
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He is no more a master of words than an ordinary person.B
He can convey his ideas in words which sing like music.C
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单选题“This overuse of wrapping is not confined to luxuries.” (line 4, Paragraph 1) means ______.A
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the wrapping used for luxury products is unnecessary
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单选题Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.A
more seriousB
not less seriousC
more dangerousD
no more dangerous
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单选题The term diesel engine scavenging means（）A
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forcing the products of combustion out of the cylinder with the fresh air chargeC
collecting the air charge at the cleanerD
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单选题On a cargo vessel, fire and boat drills must be held within 24 hours of leaving port if the percentage of the crew replaced is more than （）.A
5%B
10%C
25%D
40%
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单选题A port（）if more than ordinary prudence and skill is needed to avoid exposure to danger there.A
safetyB
is safeC
is not safeD
is not safety
考题
单选题When you enable port security on an interface that is also configured with a voice VLAN， what is the maximum number of secure MAC addresses that should be set on the port？（）A
No more than one secure MAC address should be set.B
The default will be set.C
The IP phone should use a dedicated port， therefore only one MAC address is needed per port.D
No value is needed if the switchport priority extend command is configured. E
No more than two secure MAC addresses should be set.
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单选题The author most probably mentions the reactions of northern White writers to non-Europeanized “sorrow songs” in order to _____.A
suggest that White writers benefited more from exposure to African American art forms than Black writers did from exposure to European art formsB
contrast White writers’ earlier appreciation of these songs with the growing tendency after the Civil War to regard Europeanized versions of the songs as more acceptableC
show that the requirement that such songs be Europeanized was internal to the African American tradition and was unrelated to the literary standards or attitudes of White writersD
demonstrate that such songs in their non-Europeanized form were more imaginative
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