Being overweight increases a person’s risk of heart disease, stroke, and high blood pressure. Studies have shown that high-protein diets help people lose weight who have not been able to lose weight in any other way. Therefore, high-protein diets can be an important part of a healthy lifestyle.
Which of the following, if true, most undermines the conclusion expressed above about high-protein diets ？（）

A. High-protein diets have been linked to heightened rates of high cholesterol, stomach cancer, and kidney failure.

B. High-protein diets are easier than conventional diets for most dieters to follow because they allow dieters to eat filling foods like meat and eggs.

C. Although many dieters initially show rapid weight loss on high-protein diets, most of them regain the weight as soon as they go off the diet.

D. Society should be more understanding of overweight people, and should not pressure them to pursue extreme diets.

E. The high-protein diet fad has created a niche dieting industry that grosses over $2 billion per year.

不是CDZ53举高消防车上车液压系统无压力或压力很低故障原因的是（）。

A.吊臂支架上的行程开关损坏

B.变量泵斜盘卡住或其中的压力控制、流量控制阀出现故障

C.正反馈油路堵死

D.上车电液比例阀中的反馈油路出现故障，使泵排量很小