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问题 单项选择题

作细菌血浆凝固酶试验时，要求每天作阳性及阴性菌种质控，常用的阴性控制菌种是下列哪一种（）。

A.金黄色葡萄球菌

B.表皮葡萄球菌

C.两者均可

D.两者均不可

答案

参考答案：B

单项选择题

Forty-five percent of all blood donated in the United States is type O. Type O blood is essential for emergencies where there is no time for determining the blood type of victims because type O blood can be used for everyone. Type O blood is unique in that it is compatible with blood of all types: any recipient, regardless of blood type, can be given it. But precisely because of this special usefulness, type O blood is chronically in short supply.
If the statements in the passage above are true, which of the following must also be true

A．The special usefulness of type O blood lies in the fact that it matches the blood type of most people.

B．Supplies of type O blood are continuously so low that type O blood is unavailable for emergencies, where its usefulness would be greatest.

C．Forty-five percent of the total population of the United State has type O blood, which makes type O the most common blood type.

D．Any decision to give blood of any type other than O needs to be based on knowledge of the recipient’s blood type.

E．(E) Type O blood is the only blood that cannot be typed as fast as needed in emergencies.
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单项选择题 案例分析题

患者，女性，67岁。晨练时跌倒后左手掌着地，遂感腕部疼痛、肿胀、畸形、活动受限。

问题2：考虑该患者可能为克雷（Colles）骨折，最典型的体征应是（）。

A.腕部肿胀

B."餐叉样"畸形

C.骨擦感

D.局部压痛

E.反常活动

F.腕关节活动受限
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