●Applications put computers to practical business (67) ，but below the (68) it's the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program，connect to networks and store (69) ．

●Which of the following methods is used to increase the number of processes sharing the CPU? (72) ．

●Which of the following statements describe(s)the properties of a purely segmented memory system? (73) ．

●In the WAN，when a point-to-point subnet is used，an important design issue is the roucer interconnection (74) ．

● (75) is a sequence of letters and digits,the first character mustbe a letter.

●试题二