慢性化脓性中耳炎，鼓膜穿孔位于前后皱襞及锤骨短突之上者，如图

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问题单项选择题

慢性化脓性中耳炎，鼓膜穿孔位于前后皱襞及锤骨短突之上者，如图所示，称为()

A．中央性穿孔

B．紧张部穿孔

C．边缘性穿孔

D．松弛部穿孔

E．上述都不是

答案

参考答案：D

单项选择题

A client has a total serum cholesterol level of 326 mg/dL. The nurse explains to the client that this level

A．is normal and requires no further treatment.

B．is high and will require dietary modification.

C．is low and requires no further treatment.

D．is borderline normal and may require dietary modification.

问答题简答题

怎样计算真误差？