雾出现的大致时间（）.A.日出前，锋面过境前后。 B.早晚较多。 发布时间：2017-11-19 16:24 │ 来源：www.tikuol.com 题型：单项选择题 问题： 雾出现的大致时间（）.A.日出前，锋面过境前后。B.早晚较多。
题型：单项选择题 35．Applications put computers to pratical business (1) , but below the (2) it’s the heart of an operating system—the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store (3) . A traditional kernal provides all the functions for applications. The kemal (4) memory, I/O devices and parcels out processor time. The kernel also supports security and fault (5) , which is the ablity to recover automatically when parts of the system fail.(4)A．managesB．manageC．managedD．managing 查看答案
题型：单项选择题 焊接钢管的安装应符合下列规定（）。A.焊缝坡口的型式应符合设计要求B.管段对口纵向焊缝应相互错开，并处于易检的部位C.大于或等于DNl000mm的管道，应采取双面焊接并清根D.钢管加固环的位臵和焊接方式应符合设计要求，加固环对接焊缝应与管道纵向焊缝错开 查看答案