尿素(分子式为(nh2)2co)每包毛重大于10千克（　）

计算题：计算氮肥硫酸铵[（NH）4SO4]和尿素[（NH2）2CO]中的含氮量。

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The full title of the U.K. is the United Kingdom of （）and （）

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有关尿素[CO（NH2）2]的说法正确的是（）

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public and private colleges and universities and community colleges offer（）.

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尿素的分子式为（）氧含量为≥46%

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（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.

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The way in which people address each other depends on their age, sex, social group and personal relationship. The English system of address forms frequently used includes first name, last name, title+last name, （）, and kin term.

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纯净的氯化钾(片状;每包重10千克)

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Solid waste generation，and electricity and water consumption are costly and have their own set of environmental（）.

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