南方电网电力数字同步网的二级节点必须配置（）、GPS和北斗。
A.铯钟
B.铷钟
C.时钟
D.原子钟
参考答案：B
The residents in the neighborhood all ________ the government's decision to close the small dye factory.[ ]
A. deleted
B. identified
C. interrupted
D. applauded
妇女骨盆倾斜度正常值为
A．30°
B．50°
C．60°
D．65°
E．70°
