在回转窑生产熟料过程中形成大量液相的位臵：（）
A.预热带
B.分解带
C.放热反应带
D.烧成带
参考答案：D
Mum，you really need to have a rest！You ________in the kitchen ever since you came back home three hours ago.
A．had worked
B．were working
C．have been working
D．worked
分析液压舵机达不到最大舵角的常见原因。
