新军事变革的内容中，军队结构的变革强调指挥结构需要向（）指挥结构转变。
A.倒金字塔状
B.线型
C.树状
D.网状
参考答案：D
若抛物线C：y＝ax2＋bx＋c与抛物线y＝x2－2关于x轴对称，则抛物线C的解析式为
A．y＝x2－2
B．y＝－x2－2
C．y＝－x2＋2
D．y＝x2＋2
You must be tired now. Why not __________ a rest?[ ]
A. to stop to have
B. to stop having
C. stop to have
D. stop having
