Software design is a (46) process. It requires a certain amount of fl air on the part of the (47) . Design can not be learned from a book . It must be practiced and learnt by experience and study of existing systems. A well (48) software system is straightforward to implement and maintain , easily (49) and reliable. Badly (48) software systems, although they may work are (50) to be expensive to maintain , difficult to test and unreliable.

A．create

B．creative

C．creating

D．created

煤尘本身有爆炸性。煤尘爆炸是煤尘氧化后产生可燃性气体，遇高温生发生的剧烈反应。（）