For many years, the principle goal of computer (73) was to write short pieces of code that would execute quickly. The (74) needed to be small, because memory was expensive, and it needed to be fast, because processing power was also expensive.

A．users

B．programmers

C．computer

D．program

在回填土方场地上修建园路广场和水景工程，需要进行钢筋混凝土浇灌作业，编制的钢筋网直接放在碎石层上就进行混凝土浇灌。存在什么隐患？正确做法是什么？