The water clock has three parts.On the left is a tank holding water.This tank has a narrow opening through which water drips into a second container,also a tank.Inside the second tank is a floating object,to the end of which is attached a long pole with an arrow.On the right is a cylinder with the numbers one to twelve written on it.As the water from the tank on the left drips into the second tank,the level rises and with it the lfoating object.This causes the arrow to move from one number to the next.One thus has a twelve hour clock.After twelve hours the second tank is emptied and the process is begun again.
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2016年中考英语词组辨析:much too/ too much
2016年中考英语词组辨析:on time/ in time
2016年中考英语词组辨析:think of / think about/think over
2016年中考英语词组辨析:no longer/ not…any longer/no more
2016年中考英语词组辨析:stop/ station
2016年中考英语词组辨析:no / not
2016年中考英语词组辨析:mist/ fog
2016年中考英语词组辨析:middle / center
2016年中考英语词组辨析:one/ it
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2016年中考英语词组辨析:past
2016年中考英语词组辨析:real/ true
2016年中考英语词组辨析:most /a most / the most
2016年中考英语语法知识考点总结:代词
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2016年中考英语词组辨析:little/ small
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2016年中考英语词组辨析:mouse / rat
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