An administrator needs to add the /usr/vac/bin directory to their PATH environment variable for the current session. Which of the following will accomplish this task（） ["path=$path：\/usr\/vac\/bin； export path","path.=\/usr\/vac\/bin； export $path","Modify the path environment variable in \/etc\/profile","Modify the path environment variable in \/.profile"]
污染物的类比分析法，判断分析对象与类比对象之间的相似性，可以从（）等方面入手。 ["工程一般特征的相似性","污染物排放特征的相似性","项目生产方式相似性","环境特征相似性","项目区域地貌相似性"]
Given：
公称工作压力等于或大于8兆帕的气瓶是（）气瓶 ["高压","低压","中压"]
Following is the list of locations in random order where oranfstab can be placed. 1./etc/mtab 2.$ORACLE_HOME/dbs/oranfstab 3./etc/oranfstab What is the sequence in which Direct NFS will search the locations?（） [" 1, 2, 3"," 3, 2, 1"," 2, 3, 1"," 1, 3, 2"]
锁状联合
