（）is the way to deliver goods for different shippers in the same truck, by the most economic route.

[单选题]The usual way to ensure reliable delivery is to provide the (71) with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special (72) flame bearing positive or negative (73)

[主观题]In what way do you expect them to differ?你估计它们之间有哪些差别？

[单选题]（ ） transport is a reliable and cost effective way totransport goods in a l

[单选题]Pipeline is able to deliver the products based on the advantages of low rate of loss and damage, minimal climatic effects and reduced labor cost. Do you agree? （）A . Yes, I do.B . No, I do think so.C . I don’t find it hereD . I can’t find

[单选题]Networks can be interconnected by different devices. In the physical layer, networks can be connected by(66)or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data l

[单选题]Networks can be interconnected by different devices in the physical layer networks can be connected by (71) or hubs．which just move the bits from one network to an identical network．One layer up we find bridges and switches which operate at data link

[单选题]_________[A] deliver [B] carry [C] perform. [D] apply

[单选题]Robots differ from automatic machines ______after completion of one specific task, they can be reprogrammed by a computer to do another one.A． thatB． whichC． in thatD． in which

[单选题][ A] develop[ B ] differ[ C] depart[ D] derive

[单选题]I’m afraid the envelopes must be delivered at once, _____ the conference brochures won’t be mailed.(A) unless(B) in case(C) otherwise(D) yet