韶山8型电力机车各辅机自动开关脱扣动作后,需间隔()min后,才能恢复正常工作。
A、1
B、2~3
C、3~4
D、4~5
参考答案:B
That day everyone wondered _____ the baby of four went to her mother’s office.
A.how was it that
B.how it was that
C.how was it
D.how was that
患者女性,29岁,右上第二磨牙残根,慢性根尖周炎。拔除腭侧根过程中,牙根突然消失,捏鼻鼓气时拔牙窝内有气体溢出
如X线片显示患者为低位上颌窦,移位的牙根已进入上颌窦,但仍位于拔牙窝附近,此时最佳处理方法为()
A.密切观察,1周后复诊
B.刮匙搔刮取根
C.从穿孔处冲洗
D.于穿孔处开窗取根
E.上颌窦根治术