电站的开关量是指具有开和关两种状态的过程量。
参考答案：对
They are leaving for Hangzhou in ten days-________, next Friday.[ ]
A. in other words
B. in many ways
C. on the whole
D. on the contrary
X射线衍射分析在无机非金属材料研究中有哪些应用？
