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参考答案:错
In (66) the strength of the carrier signal is varied to represent binary 1 or 0. (67) is a system that can map a name to an address and conversely an address to al name. (68) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol. (69) is an approach that enables an ATM switch to behave like a LAN switch. (70) is an guided media which is made of glass or plastic and transmits signals in the form of light.
A.ASK
B.PSK
C.FSK
D.FDM
履约担保有效期满前28天,承包商尚无权得到履约证书,未能延长履约担保的有效期时,雇主可以索赔履约担保的( )。
A.一半金额
B.全部金额
C.两倍金额
D.三倍金额