溶液加热器中可以通入蒸汽进行加热。

认真观看、分析上边的漫画，并运用所学的知识回答下列问题：请运用第2课的观点谈谈这幅漫画给我们什么启示？

__________________________________________________________________________________________________________________________________________________________________

2009年10月9日，中国东方航空公司与上海航空公司联合重组获通过。通过重组方式可以把企业的规模做大，从而形成竞争优势。除此之外，企业为增强竞争力还可以采取的措施有：①掌握先进的科学技术②扩大董事会的权力③聘请外籍人员任总经理④提高商品质量和服务水平

A．①③

B．②③

C．①④

D．②④

为什么高浓度食盐溶液会对微生物产生强烈的脱水作用？

大型（）常采用蜗壳式或导叶式。

A.渣浆泵

B.混流泵

C.污水泵

D.清水泵

Regulations are frequently implemented that attempt to deal with markets with high barriers to entry. Which statement is least likely to be a reason why they often fail（）

A. Regulators prevent monopolists from making a profit.

B. Regulators fail to fully understand the firms cost curves and demand schedule.

C. An existing firm in the industry is able to influence the regulatory board.