房地产估价的合法原则要求在进行房地产估价作业时应以（）为前提来进行工作。
A．公正
B．公平
C．公开
D．估价对象的合法权益
参考答案：D
“If you are to succeed, you must put your shoulder to the wheel." my head teacher _______ says to the class.
A．curiously
B．consequently
C．confidently
D．constantly
化工生产中的对流传热的过程是怎样的？
