乙烯制冷压缩机10-K-601提供三个冷剂温度是(),()和()。
参考答案:-101℃;-75℃;-63℃
Did you ask for a leave? [ ]
A. two-day
B. two day's
C. two days'
D. two-days'
在公路设计时,设计速度有何重要作用?如何选用设计速度?