家用计算机上网时所用调制解调器的作用是实现（）。 ["计算机数字信号与电话模拟信号的相互转换","数字信号向模拟信号的转换","模拟信号向数字信号的转换","计算机与局域网的连接"]
The rules require which factor to be taken into account when determining safe speed（）. ["The construction of the vessel","The experience of the vessel's crew","The location of vessels detected by radar","All of the above"]
YS-88型微机录波器如何进行故障分析和测距？
影像景深的因素（）。 ["允许分散圈直径","光圈","镜头焦距","调焦距离"]
系统提示某企业的营业期限届满（外国地区企业常驻机构驻在期限届满）未延续的，则应当（） ["由企业登记机关实施警示管理","指导其及时办理营业期限（驻在期限）变更登记","对营业期限（驻在期限）届满不再延续的，告知其应当组织清算、办理注销登记","对尚未办理营业期限（驻在期限）变更登记和清算组备案（公司制企业）的，不予办理年检"]
YS-88型微机录波器能实现哪些通信和远传功能？
