患者，男性，10岁，1个月前有上呼吸道感染史，半个月前开始出现双侧下肢出血点、出血斑

呼吸衰竭最主要的临床表现是（）

A.呼气费力伴呼气延长

B.呼吸频率增快

C.呼吸困难与发绀

D.神经精神症状

E.双肺大量湿性啰音

地面维护人员如何判断氧气瓶是否已超压释压？

甲和乙签订了一份棉花买卖合同，约定甲卖给乙棉花5吨。但后来乙下落不明，甲难以履行债务，遂将棉花提存。棉花提存后，一日遭遇雷击烧毁，该损失应由（）。

A．乙承担

B．甲承担

C． 乙和甲共同承担

D．提存机关承担

社区获得性肺炎，最为常见的致病菌是

A．葡萄球菌

B．肺炎支原体

C．肺炎克雷白杆菌

D．肺炎链球菌

E．流感嗜血杆菌

Woman: If the weather is this hot tomorrow, we may as well give up the idea of playing tennis in the afternoon.Man: Oh, I don't think it'll last long. The weather forecast says it will cloud over by midafternoon.Question: What does the man mean

A．Weather forecasts are not reliable.

B．They'd better change their mind.

C．The tennis game won't last long.

D．They shouldn't change their plan.