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圈梁是为了增强建筑物的整体刚度和稳定性，提高建筑物的抗风、抗震和抗温度变化的能力，防止地基不均匀沉降对建筑物的不利影响，沿建筑物的内、外墙在水平方向周围设置的封闭式钢筋混凝土梁。( )

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单项选择题

Aspirin is one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild. It is also cheap.For millions of people suffering from arthritis, it is the only thing that works. Aspirin, in short, is truly the 20th-century wonder drug. It is also the second largest suicide drug and is the leading cause of poisoning among children. It has side effects that, although relatively mild, are largely unrecognized among users.Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of tree barks and leaves which today are known to contain a chemical found in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.A small quantity of aspirin relieves pain and inflammation. It also reduces fever by affecting some of the body’’s reactions. Aspirin is very irritating to the stomach lining. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice.

Aspirin was invented in________.

A．the 20th century

B．the 19th century

C．ancient Greece

D．ancient Germany
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判断题

锁式封识（A型）、夹簧式封识（B型）、直销式封识（D型）适用于各种集装箱、货柜车、铁路棚车施封。（）
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