【单选题】选择液压油时 , 为减少漏损 , 在使用温度、压力较低或转速较高时 , 应采用 ( ) 的油。
【单选题】检查和保养电器时要切断电源,机车辅修、小修时要用()的压缩空气吹扫电器,或用毛刷、棉布擦拭电器,使各电器保持清洁干燥。
【判断题】if you don't speak someon's language, it's always safe to use gestures.
【单选题】等差数列的首项为2,末项为62,公差为4,则这个数列共有多少项
【单选题】Could you give me some on how to learn English well? [ ]
【单选题】临产后阴道检查了解胎头下降程度时,作为标志的是
【单选题】—How will you deal with these papers, Ann? —I will leave them to takes over the job.