项目安委会常务副主任由谁担任业主项目部安全管理专责。
参考答案：错
合成尿素最主要的器官是
A．脑
B．心
C．肝
D．肾
E．胃
开放作文。
请根据下面提示，写一篇短文。词数不少于50。
In your English class, you are asked to describe the following picture and explain to your classmates
how you understand it.
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