Programming is a (46) that has various engineering and (47) aspects. Although most of these aspects are interrelated, each of them covers a number of (48) and goals winch are very specific. The progress being made in teaching (49) is reflected by the fact that most (50) science curricula contain a broad spectrum of programming courses, each emphasizing a different aspect of programming.

（48）处是（）

A.notation

B.physical

C.function

D.discipline

E.philosophy

F.softwareengineering

G.characteristics

H.mathematical

I.mathematical

J.program

K.method

L.computer

为什么工作面要控制顶板不出现台阶下沉？