()铸铁因为其性能硬脆,难以加工,主要用做炼钢原料。
A.麻口铸铁
B.白口铸铁
C.灰口铸铁
D.球墨铸铁
参考答案:B
刀具补偿分()两种。
All known techniques for handling complex problems successfully seem to fall into one of the three classes: subdividing the problem (51) , ignoring irrelevant detail in a safe way (52) , and having an independent agent (53) the internal consistency (contextual checking). The first two provide guidelines for solving the problem, the third serves to provide early warnings. A good programming language supports all three.
In subdividing problem, some of the subproblems may be similar to the (54) problem. It leads us to a (55) solution. This (55) solution is viable provided each of the subproblems is easier to solve than the original problem.
(52)是()
A.abrogation
B.abstraction
C.composition
D.contraction