问题
单项选择题
筒体与封头或端盖的焊接连接，一般不能采用（）连接结构。
A.角焊
B.塔接焊
C.对接焊
D.立焊
答案
参考答案：A
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筒体与封头或端盖的焊接连接，一般不能采用（）连接结构。
A.角焊
B.塔接焊
C.对接焊
D.立焊
参考答案：A
We have no idea about 1 men first began to use salt. But we do know that it had been used in many different ways __2___ the history. For example, in many history books it is __3__ that people who lived three thousand years ago __4__salted fish. Thousands of years ago in Egypt（埃及）, salt __5_ keep the dead. It can keep the dead bodies __6__ decay.（腐烂） In the eighteenth century, a person who stole salt was __7__ to have broken the __8__. if a person was caught stealing salt, he would be thrown into __9__. Books also record that in England about ten thousand people were put into prison during that century _10__ stealing salt! In the year 1553, if a man took __11__ than his share of salt, he would be thought to have broken the law and would be __12__ punished(惩罚). Salt was very __13__ on the dinner table of a king. It was always put __14__ the king when he sat down to eat. Then important visitors sat near the salt __15_ less important visitors were given seats farther away from it.
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