处理下列哪种故障时,一般不需要闭合ACK2?()
A.主电路接地故障
B.主变压器油泵停止故障
C.ACK1接通不良故障
D.主变压器三次侧过电流故障
参考答案:D
Instead of sending patients a letter as a reminder, now most UK hospitals use short mes sages to remind the patients of appointments.
错畸形的矫治目标是()
A.理想正常
B.个别正常
C.功能正常
D.满足患者的要求
E.以上都不是