【判断题】更换螺栓固定的斗齿时,如果螺母拧不下来,可以用割枪割下,但注意保护斗齿座。()
【单选题】( )V安全电压等级,适合潮湿场所,如矿井、地下室、地道、多导电粉尘及类似场所所使用的电气线路、照明灯和其他用电器具。
【单选题】There is a wide ________of reference books to be found, so ________you look for some material needed, you can turn to me.
【单选题】John, can't you be careful? You have _____ some figures in your calculations. [ ]
【简答题】下列项目中,属于其他业务收入的是( )。
【单选题】Have you found some information about that writer ______ you can use in your article.
【单选题】If you found some problems in the report, you may make some _________.