【简答题】governments,media and people around the world have become very worried about something called sudan i ( 苏丹红1号).this chemical dye,_1_ in many food products, was said to _2_ cancer. newspapers told ever...
【单选题】液压泵是将机械能转换成( )的能量转换装置。
【多选题】液压泵是将机械能转换为液压能的能量转换装置,是液压系统的主要组成部分,其性能好坏直接影响液压系统的工作性能,常用的变量液压泵有:
【单选题】If you are hungry in the library,______.
A.
you have to go out of the library to eat something
B.
you could eat something quietly in the reading room
C.
you could eat something in the food area
【简答题】液压泵是一种将 能转换成 能的 转换装置。
【判断题】在液压系统中,液压泵是将机械能转换成液体压力能的装置,而油缸则是将液体压力能转换成机械能的装置。
【判断题】drug resistant 的意思是耐药性的。