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【单选题】
数列2,4,6,8,10....的通项公式为( )A.
2n-1
B.
2(n-1)
C.
2n
D.
2n+1
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【单选题】Cuttlefish are intriguing little animals. The cut tlefish resembles a rather large squid and is, like the octopus, a member of the order of cephalopods. Although they are not considered the most highl...
A.
Cuttlefish are a type of squid.
B.
Cuttlefish use jet propulsion as one form of locomotion.
C.
The cuttlefish does not have an exoskeleton.
D.
Cuttlefish are the most intelt cephalopods.
【单选题】用惠斯通电桥测电阻时,如果下列一个情况出现,而其余正常,试选择仍能正常测量的是:( )
A.
有一个桥臂电阻为零（短路）
B.
有一个桥臂电阻为无穷大（开路）
C.
电源与检流计位置互换
D.
检流计支路不通（断线）
【单选题】Observing the little boy’s guilty blink, I soon came to the __________ that he was lying.
A.
conversation
B.
conclusion
C.
consideration
D.
consumption
【单选题】Cuttlefish are intriguing little animals. The cut tlefish resembles a rather large squid and is, like the octopus, a member of the order of cephalopods. Although they are not considered the most highl...
A.
to prove the intelce of cuttlefish
B.
to explain the communication habits of cuttlefish
C.
to produce a fanciful description of the “chameleon of the sea”
D.
to describe the “chameleon of the sea” informatively and entertainingly
【单选题】A little more than a century ago, Michael Faraday, the noted British physicist, managed to gain audience with a group of high government officials, to demonstrate an electro-chemical principle, in the...
A.
politicians tax everything
B.
people are skeptical about the values of pure research
C.
government should support scientists
D.
he was rejected by his government
【单选题】Cuttlefish are intriguing little animals. The cut tlefish resembles a rather large squid and is, like the octopus, a member of the order of cephalopods. Although they are not considered the most highl...
A.
I. Explanation of why cuttlefish are intriguing II. Communication skills of cuttlefish
B.
I. Classification and difficulties of observing cuttlefish II. Scientific explanation of modes of cuttlefish communication
C.
I. Explanation of the cuttlefish’s method of locomotion II. Description of color displays in mating behavior
D.
I. General classification and characteristics of cuttlefish II. Uses and beauty of the cuttlefish’s ability to change color
【单选题】Cuttlefish are intriguing little animals. The cut tlefish resembles a rather large squid and is, like the octopus, a member of the order of cephalopods. Although they are not considered the most highl...
A.
The cuttlefish can be cooked and eaten like its less tender relatives, the squid and octopus, but must still be tenderized before cooking in order not to be exceed ingly chewy.
B.
On a scuba dive when you’re observing cuttlefish, it is best to move slowly because cuttlefish have excellent eyesight and will probably see you first.
C.
Cuttlefish do not have an exoskeleton; instead, their skin is covered with chromataphors.
D.
By far, their most intriguing characteristic is their ability to change their body color and pattern.
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