[单选题]24、导线巡视时检查导线有无断股、损伤、烧伤、腐蚀的痕迹，绑扎线有无脱落、开裂，连接线夹螺栓是否紧固、有无跑线现象，7股导线中任一股损伤深度不应超过该股导线直径的1/2，19股及以上导线任一处的损伤不应超过（ ）股。
A.2
B.3
C.4
D.5

By almost any measure, there is a boom in Internet-based instruction. In just a few years, 34 percent of American universities have begun offering some form of distance learning (DL), and among the larger schools, it’s closer to 90 percent. If you doubt the popularity of the trend, you probably haven’t heard of the University of Phoenix. It grants degrees entirely on the basis of online instruction. It enrolls 90,000 students, a statistic used to support its claim to be the largest private university in the country.
While the kinds of instruction offered in these programs will differ, DL usually signifies a course in which the instructors post syllabi (课程大纲), reading assignments, and schedules on Websites, and students send in their assignments by e-mail. Generally speaking, face-to-face communication with an instructor is minimized or eliminated altogether.
The attraction for students might at first seem obvious. Primarily, there’s the convenien
A. earn their academic degrees with much less effort
B. save a great deal on traveling and boarding expenses
C. select courses from various colleges and universities
D. work on the required courses whenever and wherever

阅读下列说明，回答问题1至问题3，将解答填入对应栏内。

【说明】
某承建单位乙通过投标获得了某企业甲信息系统建设项目总包任务，主要建设内容是主机系统建设、系统软件采购和应用软件开发。甲分别与承建单位乙、监理单位丙签订了承建合同、监理合同，在两份合同中均给出了一些特定的免责条款。