演绎
参考答案：
从理论解释出发，寻求数据以检验理论的预测。
—Oh, why is the bar still ________.
—They are having a brief staff meeting. ________
A．closing; Don't worry!
B．open; Let's wait.
C．opening; I'm afraid.
D．closed; Be patient!
氢氮比为何是较难的控制参数？
