液压转向式动力转向系统中,转向动力缸将机械能转化为液压能,使转向轮克服阻力矩转动做功。()
参考答案:错
解析:
转向动力缸将液压能转化为机械能。
有一位大面积烧伤的病人,其伤面有大量液体渗出而需要输血,输血是最好输( )
A.全血
B.浓缩的血小板全液
C.浓缩的红细胞悬液
D.血浆
Over a very large number of trials, the probability of an event () is equal to the probability that it will not occur.
A. occurring
B. occurred
C. occurs
D. occur