A、 B、 C、 D、……

单项选择题A． B． C． D．

问答题Read the following sentences or paragraphs and point out the key elements (input, tool, operation and output) of each process. 1) Milling is carried out on a machine tool called a “milling machine” that is used for the shaping of metal and other solid materials. Input: [填空1] Tool: [填空2] Operation: [填空3] Output: [填空4] 2) Casting is a manufacturing process by which a liquid material is poured into a mold containing a cavity of the desired shape, and then allowed to solidify. Input: [填空5] Tool: [填空6] Operation: [填空7] Output: [填空8] 3) Stamping is a metal working process in which sheet metal is formed into a desired shape by pressing or punching it on a machine press. Input: [填空9] Tool: [填空10] Operation: [填空11] Output: [填空12] 4) With current technology, the most effective method of CO ₂ capture from the flue gas of a PC plant is by chemical reaction with an organic solvent such as monoethanolamine (MEA), one of a family of amine compounds. In a vessel called an absorber, the flue gas is “scrubbed” with an amine solution, typically capturing 85% to 90% of the CO ₂. The CO ₂ -laden solvent is then pumped to a second vessel, called a regenerator, where heat is applied (in the form of steam) to release the CO ₂. The resulting stream of concentrated CO ₂ is then compressed and piped to a storage site, while the depleted solvent is recycled back to the absorber. Input: [填空13] Tool: [填空14][填空15][填空16] Operation: [填空17] [填空18][填空19][填空20]Output: [填空21]