Shell-mold casting can produce many types of castings with close dimensional tolerances and good surface finish at low cost.
举一反三
- For sand casting, almost any metal can be cast no limit to part size, shape or weight low tooling cost.
- Individuals Lin<br/>and Li<br/>both produce good X. Lin has a<br/>comparative advantage in the production of good X if Lin ( ) A: has a lower opportunity cost of producing good X than<br/>has Li. B: has a lower opportunity cost of producing good X than<br/>of producing good C: can produce more units of X in a given time period<br/>than can Li. D: can produce X using newer technology than can Li.
- Which of the following describes comparative advantage? A: To produce a bushel of wheat Farmer John must give up 2 bushels of corn whereas Farmer Ben must give up 3 bushels of corn. B: Company A can produce 4 boxes of cereal in a day whereas Company B can produce 5 boxes of cereal in a day. C: Firm A can produce a good at a cost of $3 and Firm B can produce the good at a cost of $4. D: Jane can type 50 words per minute and Joe can type 60 words per minute.
- Although the model looks good on the surface, it will not bear close ________.
- Plastic bags are useful for holding many kinds of food ______ their cleanness, toughness and low cost.