The average (arithmetic mean) of three numbers is 90. The sum of two of the numbers is 150. What is the value of the third number?

[单选题]《混凝土结构耐久性设计规范》规定，预应力混凝土构件的混凝土最低强度等级不应低于（　）。

[名词解释题]不当得利

[单选题]下列不属于公认的生命伦理学前沿问题的是（）

[单选题]《铁路旅客运输办理细则》规定，因（）造成的行李、包裹损失，承运人承担责任。

[填空题]网络资源包括有（）、（）、（）和（）四种类型。

[问答题]为什么说生产方式是社会存在和发展的决定力量？

[单选题]关于万向传动装置的描述正确的是（）。

[名词解释题]合作经营企业

[填空题]研究表明，如果有效地提高机体水平，每次锻炼至少需要（）时间。

[单选题]小青龙汤中主要起温肺化饮作用的药物是（　　）。

非专业可以考出版资格证书吗？有哪些报考条件？

关于BEC考试有哪些备考建议？

为什么要考BEC？

有哪些学习商务英语的好方法？

商务英语考试（BEC）难不难？

都说GRE考试难，那么它究竟难在哪？

什么是GRE考试？

雅思考试在即，如何快速备考？

说说雅思考试那些事

雅思5.5相当于CET几级的水平？

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