广东移动《动力系统维护细则》规定：高频开关整流变换设备的有效使用周期是10年。
参考答案：错
The TV program Dad, where are we going?, five dads and their kids take a journey in different places, becomes hot in China.
A．when
B．where
C．which
D．that
提高胶带牵引力，通常采取哪些方法？
