血压160-179/100～10的九次方mmHg见于E．
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Futures contracts can be______.
A. used as protection against large price swings
B. countered by an offsetting purchase or sale
C. participated by hedgers or speculators
D. all of the above
该患儿住院后确诊为房间隔缺损，并决定手术修补。下列哪项为手术禁忌证
A. 已超过最易手术年龄4～5岁
B. 胸骨左缘杂音太响，已达3级以上
C. 肺动脉瓣区第2音亢进，并固定分裂
D. 病儿已出现肺动脉高压和紫绀
E. 反复肺部感染和心力衰竭
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