题目内容
螺纹连接是一种不可拆卸的固定连接。
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在螺纹连接过程中，预紧力越大越好，这样连接越牢固。
螺纹连接件类型很多，大多数已经标准化。
Choose the right meaning of the underlined part according to the context of"Business and you life"One family reported these business activities for a certain day: issued checks to pay automobile insurance and electric bill; bought a rug and chairs; mailed a letter to order some books
What line of business is he in?
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