题目

Willie has complained to the sales manager about the PC he bought _____ screen exploded for no reason.    A. which                       B. where               C. whose                     D. when 答案：C3．已知p：x2-2x-8≤0，q：x2+mx-2m2≤0，m＞0．（1）若q是p的必要不充分条件，求m的取值范围；（2）若￢p是￢q的充分不必要条件，求m的取值范围．