单项选择题
A.单调上升的曲线B.开口环线C.闭口环线D.单调下降的曲线
A.单调上升的曲线B.单调下降的曲线C.开口环线D.闭口环线
A.1摩尔液相,0摩尔气相B.1摩尔气相,0摩尔液相C.0.99摩尔液相,0.01摩尔气相D.0.99摩尔气相,0.01摩尔液相