问题
单项选择题
在卫生桥的制作中,桥体与粘膜间的间隙应为()
A.0.5~1mm
B.1.5~2.5mm
C.3~5mm
D.6~7mm
E.8~9mm
答案
参考答案:C
在卫生桥的制作中,桥体与粘膜间的间隙应为()
A.0.5~1mm
B.1.5~2.5mm
C.3~5mm
D.6~7mm
E.8~9mm
参考答案:C
A small town named Bundanoon in Australia has decided to stop the sale of bottled water .They say that bottled water can cause environmental problems. Too many resources(资源) are used to make bottled water. Then people finish drinking the water, the bottled water will be thrown away and go into dustbins .so they require local people in the town to stop buying bottled water and use tap water to drink. Visitors are encouraged to get water from water stations in the main streets, and fill the water in bottles that can be used again .The decision has been supported by all the shopkeepers in the town. Bundanoon is the world’s first town that has got its shops to stop selling bottled water .Probably we should follow the example. Let’s stop buying bottled water and use tap water.
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