A.可控成本
B.利润总额
C.剩余收益
D.投资利润率
第1题
Packet-switching wireless networks are preferable(41)when transmissions are(42)because of the way charges are(43)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(44)for the(45)of time they use the net-work.
A.to
B.for
C.than
D.only
第2题
Packet-switching wireless networks are preferable(71)when transmissions are(72)because of the way charges are(73)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(74)for the(75)of time they use the network.
A.to
B.for
C.than
D.only
第3题
Packet-switching wireless networks are preferable(66)when transmissions are(67)bemuse of the way charges are(68)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(69)for the(70)of time they use the network.
A.to
B.for
C.than
D.only
第4题
According to the passage, Green Peak ______.
A.is the first company to install wireless sensor networks
B.promotes the application of wireless sensor networks
C.supplies batteries operating on harvested energy
D.benefits handsomely from communication technology
第5题
Wireless sensor networks promise to ______.
A.bring businesses high profits
B.further develop the sensing technology
C.turn motion into a major source of energy
D.improve the daily lives of people worldwide
第6题
Wireless sensor networks promise to______.
A.further develop the sensing technology
B.turn motion into a major source of energy
C.improve the daily lives of people worldwide
D.bring businesses handsome profits in short time
第7题
A.find
B.found
C.unfounded
D.unfound
第8题
Battery-free wireless sensor networks are made possible by the fact that ______.
A.there is energy in the environment to be utilized
B.the cost of using them has been drastically reduced
C.modern data communication consumes little energy
D.their maintenance has been greatly simplified
第9题
第10题
A.Optical fiber
B.Access point
C.Directional antenna
D.Omni-directional antenna
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