【单选题】Even though pumping from these depths is expensive, it is still cheaper than desalinating( 脱盐 )the ocean water in the largely coastal state. Some desalination plants exist where feasible, but they are...
【单选题】If a firm accepts Project A it will not be feasible to also accept Project B because both projects would require the simultaneous and exclusive use of the same piece of machinery. These projects are c...