A diesel engine performs<br/>35000 J of mechanical work and discards 45000 J of heat each cycle.<br/>The heat supplied to the engine in each cycle is () A: 10000J B: 45000J C: 25000J D: 80000J

Discards have been used by the Garbage Project to study ______. A: the proportion of materials which break down within landfills B: how much people eat and drink in their daily lives C: the fluids that leak out of MSW landfills D: how to compose the landfill wasters

Which two statements are true about traffic shaping and traffic policing？（） A: both traffic shaping and traffic policing cause retransmissions of connection-oriented protocols such as TCP B: both traffic shaping and traffic policing support the marking and re-marking of traffic C: the effects of traffic shaping and traffic policing when configured on a router are applied to outgoing traffic D: traffic shaping queues excess traffic whereas traffic policing discards excess traffic E: traffic shaping allows the traffic to exceed the bit rate whereas traffic policing prevents the traffic from exceeding the bit rate