扁平足，常用的摄影体位是A．足侧位 B．足轴位 C．足斜位 D．足负重水平侧位 E．

基础训练篇（16）

We must have water to live. __ 1________the water we use is clean and fresh, it will make us ill. The animals __ 2________ (live) in and around lakes and rivers must also have clean water. Our rivers and lakes supply most of our water. The clear, blue water found by the first American settlers has changed. Many of our water sources are now __ 3________. They are filled __ 4________ dirt and waste which cannot be cleaned out. In many places, water is not safe for us to use.

Lake Erie was __ 5________ a beautiful lake. Now it has been called “a dying lake”. Waste from nearby homes and factories has been dumped into __ 6________. Fish can no longer live in much of its polluted water. George Washington once called the Potomac “__ 7________ finest river in the world”. Now its water is no longer blue. Instead, it is soupy green. Suds(肥皂泡沫), from detergents（洗涤剂；洗衣粉） used to wash clothes, often cover the water of our rivers.

Water cannot __8___________(make) in a factory. Once water is polluted, it is __ 9________ to make it clean and safe again. We must learn to take care of the water __ 10_______ we now have.

文化产业是市场经济条件下繁荣发展社会主义文化的重要载体。阅读材料，回答问题。

材料：2006-2008年我国文化产业增加值与国内生产总值增长情况

描述上图所示的经济信息，揭示图中两条曲线之间的内在联系。

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为了防止玻璃管式水位计破裂时炉水大量冲出，在玻璃管顶部和底部装有止回装置。

基础强度达到设计的（）时，可加上全部负荷。

A.70%

B.80%

C.90%

D.100%