市场研究中可以从公开的海关统计库可以得到大量进出口信息，可以从海关统计中得到的信息有（）。 ["各种化学品的贸易进口信息","进出口贸易趋势和曲线","进口贸易商及进口地点","分年分月进出口总量和价值"]
Given: What is the result?（） ["0","1","2","3","4","Compilation fails.","An exception is thrown at runtime."]
根据测站的性质，水文测站可分为（） ["水位站、雨量站","基本站、雨量站","基本站、专用站","水位站、流量站"]
工作风缸充气止回阀在制动减压时，能防止工作风缸内的压力空气向（）逆流，以避免产生不制动或制动力不成比例的现象。 ["列车管","制动管","总风管","撒砂管"]
During reboot the system hangs with an LED 0554 message that means， "The boot device could not be opened or a read failed." What recovery procedures should be taken？（） ["Boot in maintenance and use fsck to check hd5.","Boot in maintenance mode， access the rootvg and check the \/etc\/inittab for corruption.","Boot in maintenance mode， access the rootvg and rebuild the boot image using the bosboot command.","Boot in maintenance mode， access the rootvg and use the bootlist command to create a valid boot list."]
最大残留限量
