垂直管流产生的滑脱与损失与()因素有关。
A.流动形态
B.油管直径
C.气液比
D.以上均正确
参考答案:D
Cathy is taking notes of the grammatical rules in class at Sunshine School,where she_______English for a year.
A.studies
B.studied
C.is studying
D.has been studying
“太多的货币追求太少的商品”,从而导致一般物价水平上涨,这种情形属于()通货膨胀。
A.需求拉上型
B.成本推进型
C.结构型
D.隐蔽型