汽化是热水供热系统内,由于水的压力低于该点水温下的()而产生水蒸发变成蒸汽的现象。
参考答案:汽化压力
证券市场的纵向结构关系是由一级市场和二级市场构成的。 ( )
Isimply couldn’t understand how it _______ that you did so much work in such a short time.
A.cameup
B.camealong
C.cameback
D.cameabout