在循环水量和凝汽器冷却面积一定时,每对应一个循环水进口温度,可得到凝汽器压力与排气量的关系曲线,称为凝汽器的()。
参考答案:热力特性曲线
仓储管理的两重性包括()。
A.社会属性和不均衡性
B.自然属性和社会属性
C.自然属性和生产性
D.社会属性和非生产性
According to the speaker, why did he fail to catch the point().
A.Because he was away for a while.
B.Because he simply couldn’t understand.
C.Because he was thinking about something else.
D.Because he fell asleep.