花剑对抗刺时由（）开始，手臂要用力向前伸，以剑身的（）和（）抗击对手进攻剑的前部。
参考答案：剑尖；强部；护手盘
一个SQL语句原则上可产生或处理一组记录，而主语言一次只能处理一个记录，为此必须协调两种处理方式，这是通过使用 【12】 机制来解决的。
Which of the following statements about the characteristics of a monopoly and those of an oligopoly is least accurate（）
A. In an oligopoly, there are often substantial economies of scale.
B. In both a monopoly and an oligopoly, there are high entry barriers into the market.
C. In an oligopoly, the decisions of each seller are independent of the policies followed by competitors.
