暂时冠
参考答案:暂时冠 是在冠修复的牙体预备后至最终修复完成前患者不能自由取戴的临时性全冠。
2014年巴西世界杯开幕时间将于2014年6月12日至7月13日在巴西举行。世界杯比赛再一次回到巴西,巴西世界杯比赛的赛程时间表已经出炉,巴西世界杯开幕式确定在当地时间(西3区)6月12日15:00在圣保罗进行,而里约热内卢马拉卡纳球场将承办决赛。完成问题:
(1)成都的王先生准备去观看世界杯开幕式,飞机飞行时间约13小时,下列成都起飞的航班合理的是:( )
A:6月12日11:00 B:6月13日11:00
C:6月12日14:00 D:6月13日14:00
(2)巴西世界杯举行期间达州的昼夜长短状况是________________;
正午太阳高度的变化是_______________________。
(3)若里约热内卢的正午太阳高度的变化幅度为46°20′,则里约热内卢的纬度为___________。
(4)长时间剧烈运动,尤其是高温高湿天气,为了保持正常体温,人体要大量排汗。在排汗的同时,体内液体和电解质(钠、钙、钾、镁等)会大量随汗流失,容易出现抽筋,因此巴西世界杯设置了球员喝水时间。请你从气候的角度解释本界巴西世界杯出现多名球员抽筋现象的原因。
Guangzhou (Xinhua)——12 people were killed and 20 injured early yesterday morning when they jumped from a burning train car into the path of an oncoming goods train in Southern China. When No. 247 Wuchang——Guangzhou passenger train was passing the Dayaoshan Tunnel in Guangdong Province, South China at 00 :17 yesterday, a fire caused by passengers' smoking broke out on No. 17 car. They wanted to extinguish fire. As the train stopped some frightened passengers jumped from windows. 12 people were crushed to death and 20 others injured by a northward passing goods train(No. 1766)。
1. In which direction did the passenger train travel?
A. Northward. B. Southward. C. Eastward. D. Westward.
2. When did the accident happen?
A. At 00:17 am. B. At 00:17 pm.
C. At seventeen past one. D. At seventeen to one.
3. Where did the accident happen?
A. In Wuchang. B. In Guangzhou.
C. In Hubei. D. In Guangdong.
4. What was the cause of the fire?
A. A heavy rain. B. High temperature. C. Carelessness. D. Fear.