固定桥取模时龈缘处理,常使用_______压迫牙龈数分钟,使龈缘组织暂时退缩,以便取得基牙_______预备区清晰的印模。
参考答案:缩龈线;颈缘
— The plane is due to take off at 7:50 from the airport. _____ we fail to arrive there in time?
— Try to take another flight then. [ ]
A. What if
B. As if
C. Even if
D. Only if
根据《节能发电调度信息发布办法(试行)》(电监市场[2008]13号)规定,电力调度机构负责发布()。
A.电网阻塞情况
B.日度负荷预测数据
C.电网损耗情况
D.跨区跨省电力交易情况