题目内容

简述如何选择水泥强度等级与混凝土强度等级？

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(汉译英)每个公民均可要求法律的保护。

我国证券市场上流通的证券种类主要有股票、债券、投资基金份额、认股权证、期货和应收票据等。()

抗渗混凝土(impermeable concrete) 名词解释

According to the passage, which of the following is one of the "tend-and-befriend" behaviors？

A. Quarrel with other family members.
B. Travel alone to other countries.
C. Give a hand to other people.
D. Care about the children.