皮皮学，免费搜题
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【判断题】
在BUCK电路中,输入电压50V,开关电路的驱动信号频率为100HZ,则BUCK电路输出为25VA.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The opening of atrioventricular valve can be seen in: ()
A.
isovolumic shrinkage at the end of the period
B.
ventricular systolic period beginning
C.
isovolumic diastolic period beginning
D.
isovolumic systolic period beginning
E.
isovolumic diastolic period end
【单选题】Which statement is true of the right atrioventricular valve?
A.
It is also called the mitral valve
B.
It is open during ventricular diastole
C.
It transmits oxygenated blood
D.
It is opened by the pull of chordae tendineae
E.
It consists of 2 leaflets
【单选题】利用药物和杂质在化学性质上的差异进行特殊杂质的检查，不属于此法的检查法是（）
A.
酸碱性的差异
B.
氧化还原性的差异
C.
杂质与一定试剂生产沉淀
D.
杂质与一定试剂生产颜色
E.
吸附或分配性质的差异
【单选题】Physiological significance of atrioventricular delay
A.
Widen P wave
B.
Widen the QRS wave
C.
Prolong the effective refractory period of ventricular muscle
D.
so that the atria and ventricles do not overlap
【多选题】以下快捷键中，与Shift+Del、Ctrl+Del键对应的是（）
A.
+{DELETE}、+{DEL}
B.
+{DEL}、+{DEL}
C.
+{DELETE}、^{DELETE}
D.
+{DEL}、^{DELETE}
【单选题】不属于利用药物和杂质在化学性质上的差异进行特殊杂质的检查的方法是
A.
氧化还原性的差异
B.
酸碱性的差异
C.
杂质与一定试剂生产沉淀
D.
溶解行为的差异
E.
杂质与一定试剂生产颜色
【简答题】atrioventricular delay
【单选题】The physiological significance of atrioventricular delay is: ()
A.
makes the ventricular muscle not produce complete tetanic contraction
B.
strengthens the contractile force
C.
prolongs the effective refractory period of the ventricular muscle
D.
makes the atrium and the ventricle not contract at the same time
E.
increases the amplitude of the action potential of the ventricular muscle
【简答题】La Saga del Cuochi del Sangro
相关题目：
【单选题】不属于利用药物和杂质在化学性质上的差异进行特殊杂质的检查的方法是
A.
氧化还原性的差异
B.
酸碱性的差异
C.
杂质与一定试剂生产沉淀
D.
溶解行为的差异
E.
杂质与一定试剂生产颜色