下列正确的描述是： A. 药物可通过受体发挥效应 B. 药物激动受体即表现为兴奋效应 C. 安慰剂不会产生治疗作用 D. 药物化学结构相似，则作用相似 E. 药效与被占领的受体数目成正比

多项选择题

下列正确的描述是： A.
药物可通过受体发挥效应
B.
药物激动受体即表现为兴奋效应
C.
安慰剂不会产生治疗作用
D.
药物化学结构相似，则作用相似
E.
药效与被占领的受体数目成正比

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A．对
B．错

An arterial blood gas is drawn on a 13-year-old boy who presented to the hospital with symptoms of diabetic ketoacidosis. In a hurry, the physician has the first year medical student urgently obtain an arterial blood sample for analysis. The partial pressure of oxygen (PO2) is found to be 28 mm Hg (normal >80 mm Hg) with an oxygen saturation (SaO2) of 70% (normal >94%). However,at the time of the arterial blood sampling, the patient was in no acute distress with an oxygen saturation of 99% while on room air. He has no past history of lung disease, and no wheeze or rhonchi is auscultated on examination. Which of the following best explains the patient's current presentation? ()

A．The sample was drawn lateral to the femoral artery
B．The patient has obstructive lung disease
C．The sample was contaminated with room air
D．The patient has restrictive lund disease
E．The sample was drawn medial to the femoral artery

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如果你是清代诗人袁枚的学生，那么你的老师会对你写的诗有怎样的要求？

A.独抒性灵
B.讲究格调

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一般情况下胚培养的pH值多数在5.2-6.3范围内。

A．正确
B．错误

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羽毛球运动中，反手挡网击球时，前臂内旋，带动手腕向前挥拍，拍面与地面接近垂直，球拍由左下向前上方推送切击球托底部。

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