反动度
参考答案：就是蒸汽在动叶片内膨胀时所降落的理想焓降与整个级的理想焓降之比。
There are three eggs _______ by the hen_______ under the tree.
A．lied, laying
B．lay, lying
C．laid, lying
D．lain ,laying
雅典公民权